Email Signatures per Mailbox
WarmySender allows you to set a unique email signature for each mailbox and insert it into your campaign emails using the {{signature}} merge tag.
Setting Up Your Signature:
Each mailbox has its own signature, configured in the mailbox settings dialog under the Signature tab. Go to Email Infrastructure > Mailboxes, click the three-dot menu (⋮) on any mailbox, select "View Details", and go to the Signature tab. You now edit it with the same visual editor you use for email bodies, in a compact form — pick a font, size, colour, add a link or a list — instead of typing raw markup. Signatures still support plain text and HTML. Formatting guide: /documentation/format-your-emails
Using {{signature}} in Campaign Emails:
In the campaign editor, click the Insert signature button in the toolbar, or insert the {{signature}} variable from the variable picker (or type it manually) — both do the same thing. When the email is sent, {{signature}} is replaced with the signature stored on the sending mailbox. If a campaign rotates across multiple mailboxes, each recipient automatically gets the correct signature for whichever mailbox sends their email.
Different Signatures per Mailbox:
Since signatures are stored per-mailbox, you can have a different signature for each mailbox without creating separate campaigns. Simply set each mailbox's signature in its Signature tab, then use {{signature}} in your template — the system handles the rest.
Signature Best Practices:
- Keep signatures short — 3-5 lines maximum for cold outreach.
- Include your name, title, company, and one contact method (phone or LinkedIn).
- Avoid images in signatures for cold outreach — they can trigger spam filters and increase email size.
- Avoid large HTML signatures with logos and social icons in initial outreach.
- You can also use sender merge tags ({{sender_name}}, {{sender_company}}) alongside or instead of {{signature}} for automatic personalization.
- Test your signature renders correctly by using the 'Send Test' feature in the campaign editor.
Putting Your Opt-out in Your Signature:
You can also drop {{opt_out}} into a signature (or straight into the email body). It renders as your workspace's opt-out sentence — written by you in Settings > Account, in whichever style you chose — so the opt-out reads as part of your sign-off rather than as a separate footer. When you use it, the line appended at the bottom of the email carries only your company address. Leave it out and the full opt-out line is appended as usual, so an email can never go out without one. Example signature:
Best,
Sarah Whitfield
Acme Ltd
{{opt_out}}
Note: Signatures are not automatically appended — you must include {{signature}} in your email template body where you want the signature to appear.