AI Email Subject Line Generator For Cold Email.

Write the real reason you're emailing this person, in a sentence or two, and who they are. "Ops leads at logistics firms; we match purchase orders to carrier invoices" gives the AI something specific to work with, while "our software" does not. Add one concrete detail you're happy to see in a subject line, such as a product name or a figure, because the generator only uses numbers and names that appear in your brief.

No one can promise inbox placement from a subject line alone, because filters also weigh your domain, authentication, sending history and the rest of the message. What we can do is make sure no draft carries the subject-line problems we check for: phrases from our spam list, all capitals, repeated punctuation, gappy text or a fake reply prefix. To see where a whole email lands, run an inbox placement test.

Yes, if you tick the fields you want. Drafts can use only those, written as SendCanyon merge fields such as {{first_name}} and {{company}}, and any draft that uses a field you didn't tick is dropped. Each draft that uses a field shows how it reads for a sample contact and for a contact whose field is empty, and a draft that reads badly with the field empty is left out.

Because some drafts failed our checks and were left out rather than shown with problems, and the result says how many. The usual reasons are a phrase from our spam list, a number or name that wasn't in your brief, a merge field you didn't allow, or wording that reads badly when a field is empty. A more specific brief usually gives more drafts that pass.

Yes. With preview text switched on, each subject line comes with one. In a plain-text cold email the preview is simply the opening words of your message, so treat it as a suggested first line. Drafts whose preview repeats the subject are dropped, and every subject is measured on our inbox row at seven phone widths so you can see where it is cut.

Test as many as your list can give a clear answer for. Each variant needs enough sends that a difference in replies isn't just chance, so a small list can only support two. In SendCanyon you add subject line variants to a sequence step and the campaign splits contacts between them, and your plan sets how many variants a step can have.

Use them for the first email of a sequence. A follow-up that SendCanyon sends in the same thread already carries the reply headers, and keeping the first email's subject lets it read as a reply. The generator never writes Re: or Fwd: itself, because on a first email that would be a fake reply, which Google's sender guidelines tell senders not to do.