You send the same cold emails that worked last year, and now you get no replies at all. Not a polite no, not a "wrong time", nothing. The only thing arriving back is the occasional unsubscribe. On LinkedIn the messages show as read and sit there. So you send more, and it gets quieter.
If your cold emails get no replies now and did a year ago, the usual cause is not your copy. Gmail set hard requirements for bulk senders in 2024, and Outlook now applies its own, so unauthenticated volume gets filtered or rejected rather than merely ignored. Ten specific messages beat a thousand generic ones.
This guide covers how to tell whether you are being filtered rather than ignored, what actually changed underneath you, what a burnt sending domain costs the rest of your business, the ten messages to send this week instead of the thousand, and how to keep a cold channel working once it is working again.
Is this you?
- The same template that got a few replies a week now gets none, and nothing about it has changed.
- Unsubscribes and the odd angry reply are the only responses you get.
- You increased the volume to compensate, and the reply rate fell further.
- LinkedIn messages are read and never answered.
- You have never sent one of your own cold emails to a Gmail or Outlook address you control to see where it lands.
- If someone asked you why the person you emailed this morning would want to talk this week, you could not answer in one sentence.
The last two matter most. One tells you whether the message is even arriving. The other tells you whether it deserves to.
Why it happens, including the part that is not your fault
The rules changed under you, and nobody emailed you about it
This is the single most common reason a channel that worked stops working, and it has nothing to do with your writing.
Google's bulk sender requirements took effect on 1 February 2024. For anyone sending 5,000 or more messages a day to Gmail accounts, Google now requires SPF and DKIM authentication, a published DMARC record, one-click unsubscribe on marketing messages, and spam complaint rates kept below 0.30% as reported in Postmaster Tools. Those are Google's own published thresholds, not an estimate (Google Workspace Admin Help, Email sender guidelines).
Microsoft applies its own bar to Outlook.com. Its guidance states that SPF and DKIM checks must pass, that a valid DMARC record must be published, and that at least one of SPF or DKIM must align with the domain in the From address. Mail that fails is not quietly deprioritised, it is refused outright with the error 550 5.7.515 and the message that the sending domain does not meet the required authentication level (Microsoft Support).
Read that 0.30% figure again, because it is the one most senders misjudge. It is three complaints in every thousand messages. Mark one message in 300 as spam and you are at the limit. A list that is slightly stale, or slightly bought, or slightly off-target will cross it without anyone noticing, and the penalty does not arrive as a warning. It arrives as silence.
Everyone got the same tools in the same eighteen months
This is the uncomfortable half, and it is worth saying plainly rather than skipping.
The thing that used to make a cold email work was that it looked like one person had written to another. The sequencing tools, the enrichment tools and the writing tools that made "personalisation" cheap also made it worthless, because your prospect now receives the same opening line, built from the same public detail about their company, from a dozen senders in the same week. The first line that mentions their recent post is no longer evidence that you looked. It is evidence that something looked.
So the signal moved. It is no longer "this is personalised". It is "this person has an actual reason to be writing to me today".
Volume was the strategy, and volume is now the thing being measured
When the channel was working, sending more was simply more of a good thing. Now sending more is the behaviour that gets a domain classified. Every send to someone with no reason to care is a small bet against your own deliverability, and at volume those bets compound faster than the replies do.
What it costs if you leave it
The obvious cost is an empty pipeline, and that is not the expensive part.
The expensive part is that a sending reputation belongs to your domain, not to your campaign. Once mailbox providers have decided your domain is a volume problem, the mail you cannot afford to lose starts going the same way: the quote a client is waiting for, the invoice with your payment details on it, the reply to a warm introduction. Owners in this position often spend weeks assuming a client went cold when the real story is that two of their last four emails were sitting in a Junk folder.
That is also the reason this is worth fixing properly rather than switching to a fresh domain and carrying on. The new domain inherits the habit that burnt the old one.
There is a legal floor, and volume senders are usually closest to it
In the United States, the FTC's CAN-SPAM compliance guide requires accurate From and Reply-To headers, a subject line that matches the message, a clear disclosure that the message is an advertisement, a valid physical postal address, and a working opt-out honoured within 10 business days. The guide states that each individual email in violation can draw a penalty of up to $53,088 (FTC, CAN-SPAM Act: A Compliance Guide for Business).
In the UK, PECR draws a line most senders do not know exists. You may email a corporate body such as a company, an LLP or a government body without prior consent. Individual subscribers, which includes sole traders and most partnerships, need consent or must have bought something similar from you and been given a chance to opt out. The ICO also notes that keeping a do-not-email list and honouring opt-outs is good practice regardless, and that data protection law still applies when the address belongs to a named person (ICO, Electronic mail marketing).
This is general information and not legal advice. If you are sending at volume, or emailing into the UK or the EU from outside it, get advice from a solicitor or lawyer who works on direct marketing rules in the countries you are actually sending to.
What to do now, with what you already have
None of this needs new software. The first two steps cost nothing and take an afternoon, and doing them in this order matters, because writing better messages into a blocked channel changes nothing.
1. Find out whether you are being filtered or ignored
Create a free Gmail address and an Outlook.com address, or use ones you already own, and send yourself a real cold email from your normal sending setup. Not a test with the word test in it, an actual one from your sequence. Then look at where it landed. Inbox, Promotions, Junk or nowhere at all are four completely different problems, and until you know which one you have you are guessing.
In Gmail, open the message, choose Show original, and read the SPF, DKIM and DMARC lines at the top. Each should say PASS. If any says FAIL, SOFTFAIL or is missing, stop here. That is your answer, and no rewrite will fix it.
2. Fix authentication before you write another word
SPF, DKIM and DMARC are three DNS records on your sending domain. They are not a growth tactic, they are the difference between a business and a spammer as far as a mailbox provider is concerned. Your email provider's documentation will give you the exact values to publish, and whoever manages your domain's DNS can add them in minutes. Set DMARC to p=none to begin with, which monitors without rejecting anything, exactly as Google's guidelines allow.
If you send any meaningful volume, also register your domain with Google Postmaster Tools. It is free, and it is the only way to see the spam complaint rate that Google is actually judging you on rather than guessing at it.
3. Cut the send list to ten, this week
Not a hundred with better copy. Ten. The point of ten is that it forces every message to earn its place, and it keeps your complaint rate near zero while your domain recovers.
Pick the ten from people you can describe, not from a filter. If the only thing the ten have in common is an industry and a job title, you have built a small blast rather than a short list.
4. Give every message a visible reason to be sent today
This is the whole job, and it is the step that replaces volume. For each of the ten, write one sentence naming something observable that makes this week the right week:
- They are advertising for a role that does the thing you do.
- They have opened a second location, or taken on a contract that changes their scale.
- They posted publicly about the problem you solve, in their own words.
- Something on their site is visibly broken or missing in the area you work in.
- A person you both know has just told you they are dealing with this.
If you cannot write that sentence, do not send the message. Put the name aside and come back when there is a reason. A list of ten where two have a real trigger is a list of two, and sending the other eight is what cost you the channel in the first place.
5. Make the ask small enough to answer in one line
A cold email asking for half an hour is asking a stranger to gamble half an hour. Ask something a busy person can answer badly in ten seconds: whether they handle this in-house at the moment, whether they are the right person for it, whether it would be useful if you sent the one-page version. A reply you can build on beats a meeting you never get.
And ask one thing. Two asks in one message is a message that gets archived while someone decides which to answer.
6. Make it look like it came from a person, because it should
Plain text. No tracking pixel, no image header, no footer of social icons. One link at most, and only if it is genuinely the thing they would want. A real signature with your name, your business and a way to reach you that is not the email itself, which also happens to be a CAN-SPAM requirement rather than a nicety. If you do not have one, the Email Signature Generator will build one you can paste into Gmail or Outlook in a couple of minutes.
7. Follow up twice, then stop
Two follow-ups, spaced several days apart, each adding something rather than repeating the ask. Then stop and say so: one line telling them you will leave it there and they are welcome to come back. That last line gets more replies than any of the chasing does, and it is the difference between being remembered and being blocked.
Get the follow-up dates and the words to use
The Quote Follow-up Planner gives you three follow-up dates that skip weekends and a ready-to-copy message for each one. It was built for quotes, and the cadence and the wording work just as well on the ten messages you are about to send. Free, and nothing you type is saved.
If you have already been blasting for months
Then the order changes, because your domain needs to recover before anything else will work.
Stop all cold sending from your main domain and let it rest. Keep using it for clients and warm conversations, which is exactly the traffic that rebuilds a reputation. Check your complaint rate in Postmaster Tools before you resume. Honour every opt-out the day it arrives rather than inside the ten business days the law allows, and delete anything from your list that was bought, scraped or inherited from a tool trial, because that is almost certainly where the complaints came from.
Then rebuild from the warmest list you already own, which is not strangers at all. It is the people who have already paid you once.
Our own invoice data is a useful sanity check on how large that group usually is:
About 40% of clients are billed exactly once in two years; the rest are repeat business (1,934 clients, 112 businesses).
Source: Billbooks invoice data, 8,483 invoices from 112 small businesses, September 2024 to September 2026 (aggregate only, figures shown only where 25+ businesses contribute). See the study.
Roughly two in five of the clients in that data were billed once and never again. For most businesses that is the single largest group of people who already know your work, already have a reason to hear from you, and can be emailed without any of the problems above, because you have an existing relationship rather than a cold address. Write to them as someone who did a job for them, ask what they are working on now, and do not attach a pitch.
If the deeper problem is that you have never had a channel that worked rather than one that stopped, the first-client version of this is a different job, and what to change first when you are good at the work but cannot find clients covers it.
How to keep the channel working once it works
Keep a reasons file rather than a contact list. The asset that makes cold outreach work is not a list of addresses, it is a running note of businesses plus the observable thing that would make contacting them timely. Addresses are cheap and reasons are not.
Keep it small and permanent instead of large and occasional. Ten a week, every week, keeps your complaint rate near zero and compounds. Five hundred in a burst when work goes quiet is the pattern that gets a domain classified, and it always arrives at the worst possible moment.
Measure replies, not sends. Sends are an activity you control, which is exactly why they are comforting and useless. If you track one number, track replies per ten messages, and treat a fall in it as a signal to look at your reasons rather than to send more.
Re-check authentication whenever anything changes. Moving email provider, adding a sending tool or changing DNS can quietly break DKIM alignment, and the symptom is identical to being ignored.
Then make sure a reply can become work without friction. When someone does answer, the quote and the invoice should not be the slow part of the week: if a reply on Tuesday turns into a quote on Friday, you have spent the goodwill the message earned. What to do when you sent the quote and heard nothing is the next problem along this chain, and Billbooks exists to take the quote-to-invoice step off your plate so the gap between a yes and a sent document is minutes instead of days.
Two free tools for the outreach you send next
Frequently asked questions
Why did my cold emails work last year and get no replies now?
In most cases the channel changed rather than the copy. Google's bulk sender requirements took effect on 1 February 2024 and require SPF, DKIM, DMARC, one-click unsubscribe and spam complaint rates below 0.30% for anyone sending 5,000 or more messages a day to Gmail. Outlook requires SPF and DKIM to pass with DMARC published, and refuses mail that fails. On top of that, cheap personalisation tools made a personalised opening line stop being evidence of effort. Check where your own test message lands before you rewrite anything.
Do I need SPF, DKIM and DMARC if I only send ten emails a day?
Yes, and it is the cheapest thing on this list. The strictest published thresholds apply to bulk senders, but authentication is what tells a mailbox provider you are a real business rather than someone forging your domain. It also protects the mail you cannot afford to lose, such as quotes and invoices. All three are DNS records, your email provider documents the exact values, and DMARC can start at p=none so it monitors without rejecting anything.
How many cold emails should I send a day?
Far fewer than most sequencing tools assume. If replies have dried up, start at ten a week where every single one has a written reason it is being sent this week, and grow only while replies per ten hold up. The limit is not a number of sends, it is how many messages you can send to people with a genuine reason to care. Once you are sending more than that, you are buying volume with your sending reputation.
Is cold email legal?
Commercial email is legal in most places but regulated, and the rules differ by where the recipient is. In the United States the FTC's CAN-SPAM guide requires accurate headers, a matching subject line, disclosure that the message is an advertisement, a valid physical postal address and an opt-out honoured within 10 business days, with penalties of up to $53,088 per email. In the UK, PECR lets you email corporate bodies without prior consent but requires consent or a prior purchase for individuals, sole traders and most partnerships. This is general information, not legal advice; take proper advice if you send at volume.
Should I use LinkedIn messages instead of email?
Changing channel does not fix the problem, because the reason a message gets ignored travels with it. A LinkedIn message with no visible reason to be sent today is ignored exactly like the email was, and connection requests at volume carry their own restrictions. Use whichever channel the person actually reads, and put the effort into the reason for writing rather than into the delivery method.
How many times should I follow up before giving up?
Twice, several days apart, each adding something instead of repeating the ask, then one short line saying you will leave it there and they are welcome to come back. That closing line reliably produces more replies than further chasing, and it leaves you able to contact them again when something genuinely changes. Continued chasing is what turns a non-reply into a spam complaint.
Is buying a contact list ever worth it?
No, and it is usually the direct cause of the problem this article describes. Bought lists carry stale addresses and spam traps, and the complaints they generate are what push a domain past the 0.30% rate Google measures. Under UK rules they also make consent impossible to demonstrate for individuals and sole traders. Ten names you researched yourself will out-perform a bought list of ten thousand and will not cost you your domain.
The one thing to do today
Send one of your real cold emails to a Gmail address and an Outlook address you control, then open it and read the SPF, DKIM and DMARC lines in the original message. That takes ten minutes and it tells you which problem you actually have. If any line does not say PASS, you have a delivery problem and no amount of rewriting will touch it. If all three pass and the message is in the inbox, then it is being read and ignored, and the fix is the reasons file: ten names, ten written reasons, one small ask each.
