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450 [TEMPFAIL] requires valid sender domain
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Tom Wall
Feb 13, 2009, 12:11:03 PM2/13/09
to
One of my users who works remotely began receiving this error a day or so
ago. He initially found that is was only on e-mails with file attachments.
Your message did not reach some or all of the intended recipients.
Subject: RE: e mail to Jackie
Sent: 2/13/2009 10:23 AM
The following recipient(s) could not be reached:
'Tom Wall' on 2/13/2009 10:23 AM
450 [TEMPFAIL] ourdomainname.com requires valid sender domain
ago. He initially found that is was only on e-mails with file attachments.
Your message did not reach some or all of the intended recipients.
Subject: RE: e mail to Jackie
Sent: 2/13/2009 10:23 AM
The following recipient(s) could not be reached:
'Tom Wall' on 2/13/2009 10:23 AM
450 [TEMPFAIL] ourdomainname.com requires valid sender domain
Tom Wall
Feb 13, 2009, 12:22:14 PM2/13/09
to
One of my users works remotely. He uses Outlook and POP/SMTP to send and
receive mail. He starting receiving this error intermittently when trying to
send e-mails with file attachments. His local ISP is Comcast or BellSouth.
He may be set to authenticate with them when sending outgoing mail, which
Comcast or BellSouth then forwards to our mail server. To make it even more
fun, we have a hosted SPAM/security solution which filters and forwards our
mail.
Your message did not reach some or all of the intended recipients.
Subject: RE: e mail to Jackie
Sent: 2/13/2009 10:23 AM
The following recipient(s) could not be reached:
'Tom Wall' on 2/13/2009 10:23 AM
450 [TEMPFAIL] ourdomainname.com requires valid sender domain
receive mail. He starting receiving this error intermittently when trying to
send e-mails with file attachments. His local ISP is Comcast or BellSouth.
He may be set to authenticate with them when sending outgoing mail, which
Comcast or BellSouth then forwards to our mail server. To make it even more
fun, we have a hosted SPAM/security solution which filters and forwards our
mail.
Your message did not reach some or all of the intended recipients.
Subject: RE: e mail to Jackie
Sent: 2/13/2009 10:23 AM
The following recipient(s) could not be reached:
'Tom Wall' on 2/13/2009 10:23 AM
450 [TEMPFAIL] ourdomainname.com requires valid sender domain
I would appreciate any help you can provide. Thanks.
Ed Crowley [MVP]
Feb 15, 2009, 8:33:59 PM2/15/09
to
It looks to me like he's sending his SMTP through BellSouth's SMTP server
using his reply address on your server. This is necessitated by BellSouth's
restrictions on their customers connecting via SMTP to foreign servers in
order to prevent their customers from generating SPAM, which can happen when
they're infected by viruses and worms. Very reasonably, BellSouth's doesn't
have an SRV record for his SMTP address that matches your e-mail domain, so
recipients who check that sort of thing as an antispam measure are bounding
his mail.
using his reply address on your server. This is necessitated by BellSouth's
restrictions on their customers connecting via SMTP to foreign servers in
order to prevent their customers from generating SPAM, which can happen when
they're infected by viruses and worms. Very reasonably, BellSouth's doesn't
have an SRV record for his SMTP address that matches your e-mail domain, so
recipients who check that sort of thing as an antispam measure are bounding
his mail.
The best answer is for him to use RPC over HTTPS to connect to your Exchange
server instead of using POP and SMTP.
--
Ed Crowley MVP
"There are seldom good technological solutions to behavioral problems."
.
"Tom Wall" <Tom...@discussions.microsoft.com> wrote in message
news:82DFC9E4-7453-4033...@microsoft.com...
Ed Crowley [MVP]
Feb 15, 2009, 8:38:07 PM2/15/09
to
I meant "bouncing" not "bounding".
--
Ed Crowley MVP
"There are seldom good technological solutions to behavioral problems."
.
--
Ed Crowley MVP
"There are seldom good technological solutions to behavioral problems."
.
"Ed Crowley [MVP]" <curs...@nospam.net> wrote in message
news:%235r1la9...@TK2MSFTNGP06.phx.gbl...
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