If, like me, you love your Apple MacBook but hate the lack of flexibility it offers in terms of creating an email signature then you might want to try: https://si.gnatu.re
I've tried many other signature builders out there but often there's hidden costs which stop you getting the signature that you want - you add a social media link in and suddenly that's a premium feature and chargeable!
I recently stumbled on Si,gnatu.re it's easy to use and free if you're editing in the first few days. After that there's a small charge to edit your signature (or you could just alter the code in the text edit file I'll outline below).
There's two parts - making the signature and getting it into Mail. Here's what I did:
Head over to https://si.gnatu.re and create your signature.
I previewed the output file in Chrome as it suggested as some browsers including Safari sometimes don't work well (according to the https://si.gnatu.re instructions).
I headed into mail then preferences > signatures > and created a new place for my signature to go added some random text then came out of the new entry.
I went to Finder and in the menu selected Go > Go to Folder. I then entered ~/Library/Mail/ so I could find my mail files.
I selected the most recent 'v' file (mine was v7)
I then went into signatures and searched the most recently amended file ending I'm .mailsignature (this will be the one we created in step 3).
I right clicked then selected open with and opened with 'text edit'.
I went back to https://si.gnatu.re and copied my html code
I deleted the <body> code section in text edit (delete the <body> text too) and copied in my html. The code I pasted began with a table format <table>
I saved the text edit (File > Save) then locked the text edit (click the title then select the locked checkbox).
I restarted Mail, started to compose a new email and voila! My new attractive and professional email signature was ready and waiting.
Hope it works for you!