Hi David,

Are you sending a huge number of mails? Could it be some kind of ISP SMTP limit?

HTH
Koen

Op 7-nov.-2016, om 02:07 heeft [email protected] het volgende geschreven:

> A customer sending emails from a variety of computers within their LAN 
> intermittently gets 10042 SMTP 550 mail box unavailable.
> 
> We changed the sending configuration a few months ago and things worked much 
> better for a while, but this error (10042 SMTP 550 mail box unavailable) is 
> becoming more common.



--------------------
Compass bvba
Koen Van Hooreweghe
Kloosterstraat 65
9910 Knesselare
Belgium
tel +32 495 511.653

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