The SMTP server “mail.example.co.uk” doesn’t support authentication. Home › Forums › OS X Server and Client Discussion › Mail › The SMTP server “mail.example.co.uk” doesn’t support authentication. This topic has 0 replies, 1 voice, and was last updated 21 years, 7 months ago by steve. Viewing 1 post (of 1 total) Author Posts April 12, 2005 at 3:21 pm #361284 steveParticipant HI There All We’ve suddenly started getting this error from our remote users who have to authenticate to send mail. I’ve seen the postings about the security updates – does anyone know how to fix this yet Steve Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In