Recipient receive the same message multiple times

In log of SM 15.7.6474 i have this strange lines (original recipient and sender mail address replaced):

[2017.10.12] 12:20:13 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:20:13 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:22:14 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:22:14 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:23:14 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:23:14 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:24:15 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:24:15 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:25:18 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:25:18 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:33:20 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:33:20 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:34:21 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:34:21 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:38:27 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:38:27 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:39:28 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:39:28 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:45:37 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:45:40 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:46:49 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:46:49 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:47:50 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:47:50 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:48:51 [42853] CMD: RCPT TO:<emailaddress>

[2017.10.12] 12:48:51 [42853] RSP: 250 2.1.5 <emailaddress> recipient ok

[2017.10.12] 12:48:51 [42853] Delivery for senderaddress to emailaddress has completed (Delivered)

[2017.10.12] 14:03:23 [43005] Delivery started for emailaddress at 14:03:23

[2017.10.12] 14:03:50 [43005] Delivery for emailaddress to senderaddress has completed (Delivered) Filter: None

[2017.10.12] 14:03:50 [43005] Delivery finished for emailaddress at 14:03:50 [id:23311643005]

A user, using Outlook 2016, report that the recipient of this mail receive the same message 11 times.

What could be the problem ?

Thanks

Giorgio

Giorgio Borra Replied

10/13/2017 at 1:11 AM

Checking another SM installation, v. 15.6.6347, with a different domain, same problem reported by a user, with with Outlook 2010, with the same recipient.
The recipient receive the same email multiple times.

[2017.10.12] 11:41:00 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 11:41:00 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 11:42:01 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 11:42:01 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 11:48:20 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 11:48:22 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 12:28:58 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 12:28:58 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 12:30:04 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 12:30:05 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 12:31:20 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 12:31:22 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 12:37:26 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 12:37:28 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 12:57:17 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 12:57:17 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 12:58:23 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 12:58:24 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 13:15:54 [56669] CMD: RCPT TO:<emailaddress>
[2017.10.12] 13:15:54 [56669] RSP: 250 2.1.5 <emailaddress> recipient ok
[2017.10.12] 13:16:22 [56669] Delivery for senderaddress to emailaddress has completed (Delivered)
[2017.10.12] 14:04:47 [57391] Delivery started for emailaddress at 14:04:47
[2017.10.12] 14:05:02 [57391] Delivery for emailaddress to senderaddress has completed (Delivered) Filter: None
[2017.10.12] 14:05:02 [57391] Delivery finished for emailaddress at 14:05:02 [id:83457391]

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