''krzysztof321321 [[#question-1259814|said]]'' <blockquote> When creating a message, the signature adds two dashes -. At responding / answering, the signature does not add two lines. Is it possible to set a signature so that it looks the same when creating and replying to a message? </blockquote> The delimiter is there so that when someone replies to your message, the signature is omitted from the quoted content - you don't need to see your own sig. [http://kb.mozillazine.org/Thunderbird_:_FAQs_:_Signatures#Removing_the_signature_separator It can be removed if you wish], but for replies you may see it twice if the sender's email program doesn't recognize the separator and doesn't omit the sig.