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))

Messages: 1
Karma: 0
Send a private message to this user
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.
Pavel Dobry (Kerio)

Messages: 2057
Karma: 251
Send a private message to this user
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]


Messages: 47
Karma: 7
Send a private message to this user
Are you sure there are no bugs? Recent 9.x builds are causing us a lot of random returned bounce messages use to SRS.

Messages: 3
Karma: 0
Send a private message to this user
Previous Topic: Trusted SSL certificate - worthwhile?
Next Topic: Outbox Renamed - "Delivered"
Goto Forum:

Kerio discussion forums are intended for open communication between forum members and may contain information and material posted by members which may be useful in learning about Kerio products. The discussion forums are not intended to provide technical support for any specific product. Any information implied or expressed in the discussion forums is that of the posting member. Kerio is in no way responsible for the information posted in the forums, or its accuracy. Kerio employees may participate in the discussions, but their postings do not represent an offical position of the company on any issues raised or discussed. Kerio reserves the right to monitor and maintain the forums to promote free and accurate exchange of information.

Current Time: Tue Dec 11 06:51:02 CET 2018

Total time taken to generate the page: 0.80810 seconds
.:: Contact :: Home ::.
Powered by: FUDforum 3.0.4.