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Several issues with an Exchange 2010 implementation

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  • Several issues with an Exchange 2010 implementation

    Hi,

    We've just migrated from Zimbra to Exchange 2010 some week ago & keep having trouble both receiving & sending to\from some destinations.

    I'm listing them all together as I'm new to Exchange 2010 & assume they might all be linked.

    Sending mail to certain domains result in one of the following:

    1. "550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table"

    2. "550 No Such User Here"

    3. "550 5.7.1 Unable to relay for [email protected]"

    4. "554 5.7.1 <[email protected]>: Relay access denied"

    5. "550-Please turn on SMTP Authentication in your mail client, or login to the 550-IMAP/POP3 server before sending your message. mail.ourdomain.com 550-[92.62.219.3]:7806 is not permitted to relay through this server without 550 authentication.,550-Please turn on SMTP Authentication in your mail client, or login to the 550-IMAP/POP3 server before sending your message. mail.ourdomain.com 550-[92.62.219.3]:7806 is not permitted to relay through this server without 550 authentication."

    6. "553 sorry, that domain isn't in my list of allowed rcpthosts; no valid cert for gatewaying (#5.7.1),553 sorry, that domain isn't in my list of allowed rcpthosts; no valid cert for gatewaying (#5.7.1)"

    7. "550 relay not permitted"

    I think you get the idea

    The mailboxes we send to in these domains are all valid & when sending from a Gmail account test mails to them the recipients receive then just fine.

    When it comes to receiving, some people that send us emails receive sometimes(!) this error:

    "The error that the other server returned was: 550 5.7.1 Recipient not authorized, your IP has been found on a block list"

    I guess we can add these emails to the Exception list under the "Block list providers" but that'd be crazy as it seem there are many of them, plus the providers we use are the same we used with our old Zimbra (Spamhaus, dnsbl.sorbs.net & bl.spamcop.net) & didn't have these issues.

    Any help would be really appreciated!
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