Outreach Email Template Generator
An outreach email template generator is a tool that fills a proven email structure with your details. It…
Free email subject line tester
Score your outreach subject line and see how it looks when the inbox cuts it short.
Result
0Score (estimate)
0Characters
0Words
| If the inbox shows about | Reader sees |
|---|
The score is a rule of thumb from outreach practice, not a spam filter result. Real delivery depends on your domain authentication, sending reputation and recipients' engagement.
The free email subject line tester runs in your browser, needs no sign-up and never sends what you type anywhere.
Quick answer
An email subject line tester checks a subject for the things that stop people opening it: too long, spammy or salesy words, capitals, several exclamation marks, a fake Re: and no personal detail. For link building outreach, aim for a short, specific subject under about 60 characters that mentions their site or name and says why you are writing.
What is a email subject line tester?
An email subject line tester is a tool that scores a subject line against common deliverability and readability rules. This one starts at 100 and subtracts points for length problems, spam trigger phrases, capitals, punctuation, fake reply prefixes, unfilled merge tags and missing personalisation. The score is a rule of thumb, not a filter result.
How do you use the Email Subject Line Tester?
- Type your subject line, and optionally the recipient's first name and site.
- Choose the email type: cold outreach, follow up or newsletter.
- Add the preview text (the first line of your email) to see how they read together.
- Check the score, the cut off previews at 30, 45 and 60 characters, and every warning.
- Rewrite and retest until the score is strong, then send a test email to yourself.
How long should an email subject line be?
Keep outreach subject lines short, roughly 30 to 60 characters, so the key words show before the inbox cuts the line. There is no fixed limit: Gmail, Outlook and Apple Mail cut at different widths on phones and desktops. Put the reason for the email and the recipient's site in the first few words.
What words trigger spam filters in subject lines?
No single word sends an email to spam; filters weigh sender reputation, authentication and how recipients react. Salesy phrases such as free, guaranteed, act now or rank #1 still hurt because people ignore or report them. Gmail's sender guidelines also ask for accurate, non deceptive headers.
Is it OK to start an outreach subject with Re:?
No. Gmail's sender guidelines say not to start subject lines with Re: or Fwd: unless the message really is a reply or forward. A fake Re: may get one open, but it damages trust with editors you want a long term relationship with. Use Re: only in a true follow up inside the same thread.
Quick reference
| Subject line | Score | Main issue |
|---|---|---|
| Sarah, a guest post idea for HomeFixHub readers | 100 | None: personal, specific, 47 characters |
| Quick question about your plumbing guide | 90 | No name or site |
| Re: collaboration | 65 | Fake Re:, vague, no personal detail |
| GUARANTEED Page 1 Rankings!!! | 40 | Spam words, capitals, exclamation marks |
| Hi {first_name}, partnership opportunity | 70 | Unfilled merge tag |
Worked example
Example
Example: "Sarah, a guest post idea for HomeFixHub readers" has 47 characters and 8 words, uses the editor's name and site, has a clear purpose word and no spam phrases, so it scores 100. Changing it to "Re: FREE guest post for you!!" drops the score to 33 because of a fake Re:, the word free, capitals and two exclamation marks.
Learn more
Frequently asked questions
Is the score a real spam test?
No. The score is a rule of thumb based on outreach practice. Inbox placement depends mainly on SPF, DKIM and DMARC, your domain and IP reputation, list quality and how people react. Use a seed test or Postmaster Tools for real deliverability data.
Should I put the recipient's name in the subject?
Often yes for cold outreach. A first name or the site name shows the email was written for that person, not blasted to a list. Make sure it is spelled correctly, and never leave a raw merge tag like {first_name} in the subject.
Do emojis help subject lines?
In newsletters they can stand out, but in link building and PR outreach they often look like marketing. Gmail's guidelines ask senders not to use emojis to imitate graphic elements. For editors and site owners, plain text usually reads as more personal.
What is preview text?
Preview text, or preheader, is the snippet of the email body many inboxes show after the subject. In plain outreach it is simply your first line, so make it add detail instead of repeating the subject or starting with a generic greeting.
How do I write a good guest post outreach subject?
Name their site, state the purpose and keep it under about 60 characters, for example "A topic idea for HomeFixHub readers". Avoid words like dofollow, backlink or SEO in the subject; lead with the value for their readers instead.
Does this tool store my subject lines?
No. Everything runs in your browser and nothing is uploaded, logged or saved. You can test subjects for client campaigns or private outreach lists without sharing them with any server or third party.
Sources
Facts checked against these official pages. Read how I check facts in my editorial policy.
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