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Emails from a specific domain are not received if they have attached files.

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Emails from a specific domain are not received if they ... - 6.Jan.2012 10:02:31 AM

thchow

Posts: 2
Joined: 6.Jan.2012
Status: offline

We have a 2 customers who can email us just fine, except when they send an email with attached files. Checked our spam filter and I only see the messages without attachments. I checked the Exchange 2010 logs and I only see the messages without attachments. I am able to receive emails with attachments from other customers and outside sources. We have tried small attachments and different file types. The customer is not getting an NDR or that the message was not sent. Anybody run into this issue and can provide some help?

Thank you,

Tony Chow

Post #: 1

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RE: Emails from a specific domain are not received if t... - 6.Jan.2012 11:23:16 AM

John Weber

Posts: 1208
Joined: 20.Apr.2005
From: Portland, Oregon
Status: offline

Help us understand your SPAM/AV filter setup. Are you using an offsite provider, an onsite appliance, software on the Exchange HT, or internal antispam agents?

_____________________________

John Weber [Lync MVP] http://tsoorad.blogspot.com

(in reply to thchow)

Post #: 2

RE: Emails from a specific domain are not received if t... - 6.Jan.2012 11:33:33 AM

thchow

Posts: 2
Joined: 6.Jan.2012
Status: offline

We are using software on the local Exchange server. Software is Exchange Server Toolbox. I disabled the software to test and still did not receive the messages with attachments. Reviewing the message tracking logs, I don't ever see Exchange ever receiving the messages.

Thank you,

Tony Chow

(in reply to John Weber)

Post #: 3

RE: Emails from a specific domain are not received if t... - 6.Jan.2012 11:58:07 AM

John Weber

Posts: 1208
Joined: 20.Apr.2005
From: Portland, Oregon
Status: offline

Are you using safelist aggregation with the software? Is it possible somebody blacklisted that sender or domain? Is it all users that cannot receive these files/emails or just one user?

_____________________________

John Weber [Lync MVP] http://tsoorad.blogspot.com

(in reply to thchow)

Post #: 4