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SMTP 550 error but only from AOL

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We are having intermittent issues receiving mail from anyone using AOL mail service. All other mail providers seem to work just fine. I'm hoping there's a SMTP guru in the crowd here somewhere. I've been racking my brain on this for a few days. Any ideas would be helpful. Here are the snippets from the exchange log....

If you would like any further information, just ask and I'll provide it. Thanks in advance.

Did not come through:

205.188.167.65 - oms-dc01.r1000.mx.aol.com

[11/Apr/2014:09:27:50 -0800] "MAIL -? FROM:

SIZE=2063 SMTP" 550 0

205.188.167.65 - oms-dc01.r1000.mx.aol.com

[11/Apr/2014:09:27:50 -0800] "QUIT -?oms-dc01.r1000.mx.aol.com SMTP"

240 38

__________________________________________________________________

64.12.237.10 - oms-ma03.r1000.mx.aol.com

[11/Apr/2014:09:27:51 -0800] "MAIL -? FROM:

SIZE=2043 SMTP" 550 0

64.12.237.10

- oms-ma03.r1000.mx.aol.com [11/Apr/2014:09:27:51 -0800] "QUIT

-?oms-ma03.r1000.mx.aol.com SMTP" 240 38

Came through fine:

205.188.108.133 - omr-d09.mx.aol.com [11/Apr/2014:09:31:14

-0800] "MAIL -? FROM: SMTP" 250 41

205.188.108.133 - omr-d09.mx.aol.com

[11/Apr/2014:09:31:14 -0800] "RCPT -? TO:

SMTP" 250 0

205.188.108.133

- omr-d09.mx.aol.com [11/Apr/2014:09:31:14 -0800] "QUIT

-?omr-d09.mx.aol.com SMTP" 240 61

_________________________________________________________________

205.188.108.133 - omr-d09.mx.aol.com

[11/Apr/2014:09:31:14 -0800] "MAIL -? FROM:

SMTP" 250 41

205.188.108.133 - omr-d09.mx.aol.com

[11/Apr/2014:09:31:14 -0800] "RCPT -? TO:

SMTP" 250 0

205.188.108.133 - omr-d09.mx.aol.com

[11/Apr/2014:09:31:14 -0800] "QUIT -?omr-d09.mx.aol.com SMTP" 240 61


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