[Beta 7320] Emails sent are received and bounced at the same time

Problem reported by echoDreamz - 1/18/2020 at 1:13 PM

Resolved

Remote Server returned: ''

The account does receive the email, but the sender also receives a bounceback containing the above notice.

15 Replies

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echoDreamz Replied

1/18/2020 at 1:44 PM

Update: We are also getting complaints for normal accounts, not just aliases. Comparing SMTP sessions before the 7320 update and now show no differences.

Shaun Peet Replied

1/19/2020 at 9:09 AM

We're getting reports of the same issue.

Sébastien Riccio Replied

1/20/2020 at 1:09 AM

Maybe a side effect from the fix for the NDR that were not returned when using an outgoing gateway?

7320:

FIXED: The NOTIFY attribute for forwarded message recipients is always set to NEVER.

FIXED: Failed delivery DSN messages should be properly handled when the message has no NOTIFY flag.

Sébastien Riccio System & Network Admin https://swisscenter.com

Andrew Barker Replied

1/20/2020 at 7:37 AM

Employee Post

Chris & Shaun -

Are you guys currently using outbound gateways? It might help us determine if this is related to either of the items that Sébastien mentioned.

Andrew Barker Senior Software Developer SmarterTools Inc. www.smartertools.com

Shaun Peet Replied

1/20/2020 at 8:03 AM

We are not

echoDreamz Replied

1/20/2020 at 11:40 AM

We are.

Shaun Peet Replied

1/20/2020 at 12:27 PM

We're getting lots of reports of this issue now.

Matt Petty Replied

1/20/2020 at 1:17 PM

Employee Post

Hello,

Chris/Shaun could you DM me a session from your logs that exhibits this behavior. I want to try and match this behavior with our test boxes here and see if I notice anything. I'm going to give this particular issue some focus as those bounces could cause some issues.

Matt Petty Senior Software Developer SmarterTools Inc. www.smartertools.com

echoDreamz Replied

1/20/2020 at 1:54 PM

DM'd you Matt.

Shaun Peet Replied

1/20/2020 at 2:02 PM

Here's the message from one of our users:

"my email seems to be sending out messages to people who try to email me. I'm still getting the messages, but they are getting this error message. Doesn't seem to be everyone, just a few let me know."

I'm wondering if it's related to forwarding from a User with forwarding enabled, or maybe also from an alias. I'm going to create an account for testing shortly. Interesting that our customer says she's still receiving the emails but the person who sent it in the first place is getting notification that it wasn't sent. I can see that as confusing and concerning.

Shaun Peet Replied

1/21/2020 at 1:24 PM

Hi Matt,

Did you have any luck with the logs that Chris sent you? I so far haven't been able to reliably replicate the issue but we're getting lots of complaints about it.

Shaun

echoDreamz Replied

1/21/2020 at 1:36 PM

We have about 20 tickets open right now, I expect we will receive more. Users have also stated aside from receive empty

Remote Server returned: ''

But we also have complaints of

Remote Server returned '< #5.0.0>'

Matt Petty Replied

1/21/2020 at 2:14 PM

Employee Post

Chris could you send me a full log copy for the session which demonstrated.

Remote Server returned '< #5.0.0>'

The log you sent me looked to follow this flow. I just got done doing some testing with no luck.
SMTP Client Authed -> Spool, recipient was a different (but local) domain -> the intended recipient and the sender receive messages.

However, this message above, "Remote Server returned", implies that it is a recipient on a remote server, I have not exhausted this avenue. A log would help me there. I'll be attempting this right now a bit harder though since it is potentially remote.

Matt Petty Senior Software Developer SmarterTools Inc. www.smartertools.com

echoDreamz Replied

1/21/2020 at 3:42 PM

DM'd you a few messages Matt, sorry. From what I notice... The delivery failure email is going out before SM even attempts to delivery to the remote address.

[2020.01.21] 15:33:52.470 [39948] Sending remote mail for 0100016fca3ce80d-a52af255-67fa-4410-a151-26bc3ebaaccb-000000@amazonses.com

SM doesnt attempt delivery to the user until 15:33:52, however, SM delivery logs show that the bounce was being sent before it at 15:33:27

[2020.01.21] 15:33:27.929 [39953] Skipping spam checks: Bounce
[2020.01.21] 15:33:28.023 [39953] MxRecord count: '1' for domain 'amazonses.com'

Matt Petty Replied

1/24/2020 at 7:12 PM

Employee Post Marked As Resolution

Just a heads up, our latest release has a fix for this. Thanks Chris and Shaun for reporting the issue. It had to do with our DSN code when a recipient setup a "forward and delete" either through custom filters or through the user page.

FIXED: DSNs are not being sent for successfully forwarded emails.

Matt Petty Senior Software Developer SmarterTools Inc. www.smartertools.com

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