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Home » Kerio User Forums » Kerio Connect » Out of Office breaks when SRS in use (Out of Office is being send to original SMTP FROM which leads to NDR error. SHould be sent to MIME Reply to (or at least to MIME FROM))
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bobac

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Hi,
I found following issue with OoO, What happened:
1. I turned on the OoO (Out of Office messages) on my account on Kerio Connect. I realized a ton of NDR in my mailbox afterwards that Kerio was unable to send an e-mail to address like " SRS0=q/Bn=M6=potomac1050.mktomail.com=356-UVH-403.0.4320.0.0 .6037.7.15745052 <_at_>smtproutes.com".
2. I investigated the issue and here is the result: We are using MAX Mail filtering service for both incoming and outgoing mail. MAX Mail implements SRS for SPF, so it rewrites the original SMTP FROM to an e-mail address just like mentioned above. When Kerio receives an e-mail, it responds with OoO to this rewritten e-mail address, which results in a bounce from <_at_>smtproutes.com as non-existent mailbox.
3. I believe, that it is a bug and OoO should use the MIME FROM (or better MIME Reply-to) address to send the OoO messages.
4 another side effect from this is that as the SMTP FROM addresses are generated as unique, the "each 7 days" feature for OoO does not work and the OoO messages are generated everytime - which is the reason I really NOTICED the issue as I got some hundred notification from the same address which resulted to hundred of NDRs in my inbox Smile

Does anybody a hind how to bypass this or it is really a bug?
Thank you for help!

Robert Houser, PB Com, spol. s r.o.
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Pavel Dobry (Kerio)

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It is not a bug. As stated in RFC 3834, chapter 4, automatic replies should use SMTP FROM, may use email From (when it is precisely defined in specification of service) and should not use Reply-to.

smtproutes.com should not produce any bounces because Out of Office response generated by Kerio Connect has empty MAIL FROM.

[Updated on: Wed, 08 June 2016 18:15]


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mwd

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Are you sure there are no bugs? Recent 9.x builds are causing us a lot of random returned bounce messages use to SRS.
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