On 2013-06-27 22:12, Gilles Chehade wrote: > On Thu, Jun 27, 2013 at 02:58:22PM -0300, Hugo Osvaldo Barrera wrote: > > Hi all, > > > > Hi, > > > > I've been failing to receive some automated emails from both yahoo > > and gmail. > > The error smtpd is printing out is: > > > > Jun 27 17:40:02 elysion smtpd[17570]: smtp-in: Failed command on session > > 00002741922c17e6: "MAIL > > FROM:<reg.mfsg22logixg2zlnmjsxeltomuys46lbnbxw6ltdn5ws2mjtg4zdgnjuhayta-hugo=osvaldobarrera.com...@returns.bulk.yahoo.com>" > > => 553 Sender address syntax error > > > > I'm wondering what the syntax error is. I tried looking at the RFCs a > > bit, but I've not found anything (though I'm sure that I skipped some > > important part). > > > > Is the "=" an invalid character, or does the address size exceed the > > limit? > > > > It probably is the address size, '=' is an acceptable character. > With release, we had a maximum user-part of 64 bytes, which was what RFC > suggested. We bumped this post-release after an exchange with the FreeBSD > maintainer and one of the guys who wrote the RFC.
So you're accepting even those that exceed the maximum? What's the current maximum? > > What version are you running ? That would by my primary MX that runs the version from OpenBSD 5.3-current from about a month ago. So yes, it is pretty old. :D > > > > As an informtive note, I've noticed that these same automated emails > > (google groups invites, and yahoo password recoveries) fail to reach > > their recipients if the recipients are using hotmail.com/outlook.com, > > amongst other popular email providers some friends use, so I don't > > strictly think smtpd is doing something wrong - I'm just curious as to > > what's wrong with those addresses. > > > > People using SMTP have been assuming infinite size in email addresses... I see. It's somewhat interesting how *some* major providers are rejecting these emails, while other accept them. Lots of those emails clearly don't make it through. > > > > Please note that I'm not complaining about this issue; I'm just asking > > what's wrong with this address and what RFC I should read (so yes, > > it *is* slighlty OT). > > > > Nope, perfectly on topic ;-) > Thanks, very informative. > > -- > Gilles Chehade > > https://www.poolp.org @poolpOrg -- Hugo Osvaldo Barrera
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