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273 posts

Ultimate Geek

# 142417 12-Mar-2014 14:05
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Hi guys,

A school I support is a CallPlus UFB customer with outgoing mail routed through

Lately we've been having some mail bounce with messages coming back to us such as:

<<< 554 5.7.1 <(redacted)@(redacted)>: Recipient address rejected: [RBL_007] your ip is listed on RBL and does not match
554 5.0.0 Service unavailable
<<< 554 5.5.1 Error: no valid recipients

Other bounce messages (from the Ministry of Education specifically) say "unknown recipient" for people in mid-conversation - usually messages before and since to/from the same recipient go through. I suspect the MoE server is really rejecting because of RBL matches too.

Sure enough, plugging ( into's Multi-RBL scanner has it come up on SORBS, and plugging "" into SORBS' database check comes up with this:

CallPlus SORBS listing screenshot

I've had this back from a member of the CallPlus business helpdesk:

It seems like the sender’s server check is having an error which causes the email to bounce back. We have checked on our end and it seems like the configuration is up to specification. The spam report from SORBS did not cause this problem as well.

Can some mail gurus provide their opinion as to what is going on here?



edit: typo in subject line "bounce" -> "bounces"

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273 posts

Ultimate Geek

  # 1004315 12-Mar-2014 14:56
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Ah. I've since been pointed (edit: thanks @nzsd) to SORBS' reputation as being overzealous and a bit of an extortion house (you sometimes have to pay to be removed from their blocklist).

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