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Cannot send SMTP mail from AR application through Office 365

Anonymous
2019-07-03T17:36:09+00:00

Cannot send SMTP mail from accounts receivable application called WinAR.  These are the errors I see in the applications log files:

550 5.7.64 TenantAttribution; Relay Access Denied

503 5.5.2 Sender already specified

I have tried both company.mail.protection.outlook.com:25 and outlook.office365.com:25 for the email settings.  It used to work fine with POP.

I have also added the external IP address to the connection filtering as allowed and added that address to the SPF.  I am at a loss for where else to look.

Here is a log file (with domain info blocked):

Emailing C:\WINAR\EMAIL\000000010013-User <******@domain.com> 07-02-2019 17:00:09

Success! 07-02-2019 17:00:10

Emailing C:\WINAR\EMAIL\000000010015-User <******@domain.com>  07-02-2019 17:00:10

Success! 07-02-2019 17:00:11

Emailing C:\WINAR\EMAIL\000000010033-User <******@domain.com>  07-02-2019 17:00:11

Email Module - E SMTP returned error. 550 5.7.64 TenantAttribution; Relay Access Denied [BY2NAM05FT026.eop-nam05.prod.protection.outlook.com]

07-02-2019 17:00:11

Email Module - E SMTP returned error. 503 5.5.2 Sender already specified [BY2NAM05FT026.eop-nam05.prod.protection.outlook.com]

07-02-2019 17:00:21

Email Module - E SMTP returned error. 503 5.5.2 Sender already specified [BY2NAM05FT026.eop-nam05.prod.protection.outlook.com]

07-02-2019 17:00:31

Email Module - E SMTP returned error. 503 5.5.2 Sender already specified [BY2NAM05FT026.eop-nam05.prod.protection.outlook.com]

07-02-2019 17:00:41

Email Module - E SMTP returned error. 550 5.7.64 TenantAttribution; Relay Access Denied [DM3NAM05FT035.eop-nam05.prod.protection.outlook.com]

07-02-2019 17:00:55

Email Module - E SMTP returned error. 550 5.7.64 TenantAttribution; Relay Access Denied [DM3NAM05FT032.eop-nam05.prod.protection.outlook.com]

07-02-2019 17:01:09

Microsoft 365 and Office | Subscription, account, billing | For home | Windows

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  1. Anonymous
    2019-07-03T19:17:40+00:00

    As I stated there are many other documents like that available via an Internet search.

    Good luck!

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  2. Anonymous
    2019-07-03T19:10:45+00:00

    I did read that but it does not apply as we are pure Office 365... not hybrid config.

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  3. Anonymous
    2019-07-03T19:04:29+00:00

    This is one thing I found by doing an internet search:

    https://docs.microsoft.com/en-us/exchange/troubleshoot/connectors/relay-access-denied-smtp

    There are other docs out there.

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  4. Anonymous
    2019-07-03T17:49:01+00:00

    I did try a send connector but did not have any luck with it.  Not sure of the exact settings to use.

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  5. Anonymous
    2019-07-03T17:39:43+00:00

    In the Exchange Admin Center have you setup a Connector for this application?

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