Set your email signature (it belongs to one account)

Your signature lives on a connected email account, so each mailbox can sign off differently. That is deliberate: a business sign-off should not go out from your personal address.

Set one

1. Go to Settings (the Email tab), section Email Signature.
2. If you have more than one mailbox connected, pick the account under Account. Each option says whether that account has a signature yet.
3. Choose Custom signature, write it, and click Save. On Gmail you can instead choose the Gmail signature already set up in Gmail, or No signature.

Use the same one everywhere

Once an account has a custom signature, a link appears under the editor: Use this signature for my other accounts. It copies the signature onto every other connected mailbox in one step. If any of them already has its own, TALISK_HQ names them and asks before replacing.

Why a reply used a different signature

TALISK_HQ sends a reply from the account that owns the conversation, whichever mailbox you were reading at the time. The signature follows the same rule, so a reply to a thread in one account is signed with that account's signature.

If a reply went out with no signature, the account that owns that conversation does not have one yet. Pick that account under Account in Settings and set it, or use the copy link above.

Why your signature seemed to disappear

Switching accounts in the sidebar changes which mailbox you are looking at. Nothing is deleted when you switch: the signature is still on the account you set it on. Open Settings, choose that account, and you will see it. Copy it across if you want it on the others too.