Mail Error

[guiz]

Hi,

I've created some domains and some accounts for every domain. Webmail is working properly and you could send e-mails out but when I try to send an email from out to any created account I received this error (after long time):

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This is an automatically generated Delivery Status Notification

THIS IS A WARNING MESSAGE ONLY.

YOU DO NOT NEED TO RESEND YOUR MESSAGE.

Delivery to the following recipient has been delayed:

account@domain.com

Message will be retried for 2 more day(s)

Technical details of temporary failure:
TEMP_FAILURE: Could not initiate SMTP conversation with any hosts:
[220.153.26.35. (10): Destination address required]

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Does anyone have an idea what's happening?

Please, I need help!

Thanks!