I am a web hosting provider who also provides email to my customers (a very
common situation). I would like to publish SPF records for the domains I
host, but have been unable to do so in this situation. I provide an SMTP
server for clients to use to send mail (with SMTP AUTH of course). All
email will be coming from this server for the domains I host.
Unfortunately, when I placed SPF records on these domains with the IP of my
SMTP server, mail was denied to be sent. Apparently, SPF aware mail servers
are looking at the furthest Received: header to determine whether a user is
authorized to send from that domain. Since mail is sent from the user's
computer to the mail server, the IP address of the user's computer is
checked against the SPF record. This, of course, does not match. It would
be impossible to include the user's IP address in the SPF record for the
domain because many are on dynamic IP addresses or send mail from multiple
locations. Is there any way to specify SPF records in the domains I host to
check not the user's IP address, but the address of the smtp server the mail
is coming from? Is this something that could be considered? I would
appreciate any feedback on the topic.
Thank You,
Justin Bachus
-------
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common situation). I would like to publish SPF records for the domains I
host, but have been unable to do so in this situation. I provide an SMTP
server for clients to use to send mail (with SMTP AUTH of course). All
email will be coming from this server for the domains I host.
Unfortunately, when I placed SPF records on these domains with the IP of my
SMTP server, mail was denied to be sent. Apparently, SPF aware mail servers
are looking at the furthest Received: header to determine whether a user is
authorized to send from that domain. Since mail is sent from the user's
computer to the mail server, the IP address of the user's computer is
checked against the SPF record. This, of course, does not match. It would
be impossible to include the user's IP address in the SPF record for the
domain because many are on dynamic IP addresses or send mail from multiple
locations. Is there any way to specify SPF records in the domains I host to
check not the user's IP address, but the address of the smtp server the mail
is coming from? Is this something that could be considered? I would
appreciate any feedback on the topic.
Thank You,
Justin Bachus
-------
Archives at http://archives.listbox.com/spf-help/current/
Donate! http://spf.pobox.com/donations.html
To unsubscribe, change your address, or temporarily deactivate your subscription,
please go to http://v2.listbox.com/member/?listname=spf-help@v2.listbox.com