This message has been blocked becase the return email domain is in

S

Sandy Sadsad

Hello All,

I get this error message when I try to send email to a particuar domain.
I'm trying to send an attachement and/or just a text email and when I send it
I get the error message
"This message has been blocked becase the return email domain is invalid"

I have checked wit the I/T department of where I an trying to send the
message by they are not blocking us and they say that are having no issues
with other users when they send/receive email.

Can anyone she any light on this error message and what might be wrong?
 
L

Lanwench [MVP - Exchange]

Sandy said:
Hello All,

I get this error message when I try to send email to a particuar
domain.
I'm trying to send an attachement and/or just a text email and when I
send it I get the error message
"This message has been blocked becase the return email domain is
invalid"

I have checked wit the I/T department of where I an trying to send the
message by they are not blocking us and they say that are having no
issues with other users when they send/receive email.

Can anyone she any light on this error message and what might be
wrong?
Click to expand...

What kind of mail account do you use? POP/IMAP? Exchange? This isn't a
problem with your client - it's an issue (perhaps not a problem) with the
SMTP server you are sending out through.
 
B

Brian Tillman

Sandy Sadsad said:
I'm trying to send an attachement and/or just a text email and when I
send it I get the error message
"This message has been blocked becase the return email domain is
invalid"

I have checked wit the I/T department of where I an trying to send the
message by they are not blocking us and they say that are having no
issues with other users when they send/receive email.
Click to expand...

Some mail routers refuse to route messages for which there is no reverse-DNS
lookup for the IP address of the sender. I suspect that's what's happening
in your case.

For example, one of the mail accounts I use is [email protected]. I
can send mail using this address via my ISP because I authenticate to their
server with a valid username/password. However, the next router in line may
see my IP address as, say. "172.16.0.254", and perform a reverse lookup on
that address, producing the domain "mailrouter.myisp.net" (as an example).
It then compares this with the purported domain "die.spammer.die" and sees
that they don't compare. So, the router sends an error. More simply, the
router might just try to translate "die.spammer.die" into an IP address and
fail, causing it return the same type of error.
 
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