I work on OnePassApps, the team behind app.onepassapps.com. Our Email Signature Builder is free, needs no account, and never touches your mailbox - it only writes the markup. This is a look at the HTML it actually emits, because that markup is the part that has to survive a trip through Gmail, Outlook or Apple Mail.

The builder lives at app.onepassapps.com/apps/email-signature . It opens with example details already filled in, so you can read the output before you touch anything.

What the builder writes

With those examples untouched, the HTML source pane holds 944 characters. It is a single table element with role="presentation", every rule inline, no class attributes and no style block:

<table role= "presentation" cellpadding= "0" cellspacing= "0" border= "0" style= "font-family:Arial,Helvetica,sans-serif;font-size:14px;line-height:22px;color:#252525;width:100%;max-width:600px;table-layout:fixed;" >

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One table, one row, one cell.…