I've suddenly started getting 550 errors when I attempt to send mail from my Sarge desktop host. I read my mail with mutt and run exim4. I got started with exim3 when it was default MTA for Debian and followed along as Debian moved to exim4. The error message that comes back to me when delivery fails suggests the I have not turned on SMTP Authentication in my email client, and this is very likely since I have no recollection of having ever dealt with SMTP Authentication whatsoever. Is this an issue, or should this be on by default in Debian? Where can I get info. on how to resolve this? I haven't found anything that looks like SMTP Authentication in the exim4 documentation on my machine. Is it a new feature? Or does exim4 refer to it by a different name?
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