Thank you for reporting this @Mohamed.  It is a known issue.  I will update this thread when we have more information.

I just experienced this myself.  It is working for some users but not others.  Does that fit in with the nature of the bug?

Is there already an update? The autoresponder function is a basic function that must work.

Hey buddy, make sure to enable the second option "Disable responses to Indirect mail" in the app settings and try again, test things. Last time when i have tried that option gave me the best results because the tool understands few email id's are indirect mail, make sure to test by enabling and disabling again to see which setting works although the best response will be given by the experts epic sports

I don't comment on here much. I'm an IT assistant. But I do follow the forum. It's shocking to me that this is called production software. One bug is fixed, and it breaks another thing. And some of these bugs are major. It seems to never end. I understand that it's complicated software, but ultimately, this is really not much of an excuse. Some folks have commented that the last release of V15 is very stable. My experience is that this is true. I know that there are features missing from that version, but some of our bosses happily trade these features for stability, if the product otherwise does what they want. Bottom line: In 2020, email has to work reliably, and do what it's configured to do.

@Mohamed, if you contact support they should be able to provide a link to a custom build.

Hello all, 

In Build 7565 (Sep 17, 2020), you'll find fixes for the following autoresponder issues:

- Fixed: Autoresponder is always limiting responses to once daily regardless of related setting.
- Fixed: Autoresponder is sending blank MAIL FROM instead of the known sender email address.
- Fixed: Autoresponders are not working on all messages that meet the requirements.

If you continue to have trouble with the autoresponder functionality after an upgrade to the latest version, please submit a ticket to the Support Department so we can review your installation further.

Running version 7642

Autoresponder is not working for us with external email.

In this case external means from domains not on the server.

If I send from a domain on the same server as the recipient, I get the autoresponder.

Notice in the log snippets below, the first one is same server domain to same server domain and you can see the autoresponder line.

The other one is gmail to domain and it shows no autoresponder.

 [2020.12.28] 14:22:58.401 [46017772] Delivery started for heimir@smart-mail.net at 2:22:58 PM
[2020.12.28] 14:23:01.416 [46017772] Added to SpamCheckQueue (0 queued; 2/30 processing)
[2020.12.28] 14:23:01.416 [46017772] [SpamCheckQueue] Begin Processing.
[2020.12.28] 14:23:01.416 [46017772] Blocked Sender Checks started.
[2020.12.28] 14:23:01.416 [46017772] Blocked Sender Checks completed.
[2020.12.28] 14:23:01.463 [46017772] Spam Checks started.
[2020.12.28] 14:23:01.463 [46017772] Spam Checks skipped: User authenticated
[2020.12.28] 14:23:01.463 [46017772] Spam Checks completed.
[2020.12.28] 14:23:01.463 [46017772] Removed from SpamCheckQueue (1 queued or processing)
[2020.12.28] 14:23:04.432 [46017772] Added to LocalDeliveryQueue (0 queued; 1/50 processing)
[2020.12.28] 14:23:04.432 [46017772] [LocalDeliveryQueue] Begin Processing.
[2020.12.28] 14:23:04.432 [46017772] Starting local delivery to heimir@trollweb.com
[2020.12.28] 14:23:04.432 [46017772] Autoresponse for heimir@trollweb.com to heimir@smart-mail.net queued. External Filename: 46017777
[2020.12.28] 14:23:04.432 [46017772] Process delivery status notification step from local recipient success. Recipient: [heimir@trollweb.com], Notify: [], Delivered: [True], Forwarded: [False], Deleted: False
[2020.12.28] 14:23:04.432 [46017772] Delivery for heimir@smart-mail.net to heimir@trollweb.com has completed (Delivered) Filter: None
[2020.12.28] 14:23:04.432 [46017772] End delivery to heimir@trollweb.com (MessageID: <045f01d6dd57$31fe4910$95fadb30$@smart-mail.net>)
[2020.12.28] 14:23:04.432 [46017772] Removed from LocalDeliveryQueue (1 queued or processing)
[2020.12.28] 14:23:07.448 [46017772] Removing Spool message: Killed: False, Failed: False, Finished: True
[2020.12.28] 14:23:07.448 [46017772] Delivery finished for heimir@smart-mail.net at 2:23:07 PM    [id:x46017772]

[2020.12.28] 14:03:49.719 [46017558] Delivery started for heimire@gmail.com at 2:03:49 PM
[2020.12.28] 14:03:52.735 [46017558] Added to SpamCheckQueue (0 queued; 5/30 processing)
[2020.12.28] 14:03:52.735 [46017558] [SpamCheckQueue] Begin Processing.
[2020.12.28] 14:03:52.735 [46017558] Blocked Sender Checks started.
[2020.12.28] 14:03:52.735 [46017558] Blocked Sender Checks completed.
[2020.12.28] 14:03:52.766 [46017558] Spam Checks started.
[2020.12.28] 14:03:52.781 [46017558] Spam Checks skipped: CheckList is empty (maybe previously checked)
[2020.12.28] 14:03:52.781 [46017558] Spam Checks completed.
[2020.12.28] 14:03:52.781 [46017558] Removed from SpamCheckQueue (4 queued or processing)
[2020.12.28] 14:03:55.750 [46017558] Added to LocalDeliveryQueue (0 queued; 4/50 processing)
[2020.12.28] 14:03:55.750 [46017558] [LocalDeliveryQueue] Begin Processing.
[2020.12.28] 14:03:55.750 [46017558] Starting local delivery to heimir@trollweb.com
[2020.12.28] 14:03:55.766 [46017558] Process delivery status notification step from local recipient success. Recipient: [heimir@trollweb.com], Notify: [], Delivered: [True], Forwarded: [False], Deleted: False
[2020.12.28] 14:03:55.766 [46017558] Delivery for heimire@gmail.com to heimir@trollweb.com has completed (Delivered) Filter: None
[2020.12.28] 14:03:55.766 [46017558] End delivery to heimir@trollweb.com (MessageID: <CAN5ZSMmhxdx7Qo35PaxX9QicajF=THZ+LbDA55ad_rXBQi_MZg@mail.gmail.com>)
[2020.12.28] 14:03:55.766 [46017558] Removed from LocalDeliveryQueue (0 queued or processing)
[2020.12.28] 14:03:58.750 [46017558] Removing Spool message: Killed: False, Failed: False, Finished: True
[2020.12.28] 14:03:58.750 [46017558] Delivery finished for heimire@gmail.com at 2:03:58 PM    [id:x46017558]