At 19:24 12/02/2010 Friday, James R. Marcus wrote:
Yesterday I changed completely our SPF record to -all from ~all. I started
reading the common mistakes section of the website and wasn't completely sure
about this part
"Publish null SPF records for your domains that don't send mail
Once you've protected your mail sending domains with SPF, if someone is trying
to spoof you, then first thing they will try is to spoof your non-mail sending
domains. Publishing "v=spf1 -all" says that a domain sends no mail. As an
example, you might publish:
example.com. IN TXT "v=spf1 a:mail.example.com -all"
mail.example.com. IN TXT "v=spf1 a -all"
www.example.com. IN TXT "v=spf1 -all"
"
Are there a list of common subdomains I'm supposed to add TXT records for or
just just simple ones I can think of?
no just any that already exist in your DNS records with an A or MX record
[there is no point creating new ones]
{any domains without an A or MX record will already be rejected by most
mail-recievers}
but i would point out from looking at you mail to the list that your server
actually sends with the name
relay1.edhance.com (relay1.edhance.com [67.110.143.100
so you MUST have
relay1.edhance.com. IN TXT "v=spf1 a -all"
or
relay1.edhance.com. IN TXT "v=spf1 ip4:67.110.143.100 -all"
if you want to be kinder to us all and save us the extra lookups
if you have a second machine sending as mail.edhance.com the above is fine IF
not you can set mail.edhance.com to v=spf1 -all
I have shutdown SMTP access to all but my to relay servers on the network. But
if I don't want email to come from username(_at_)www(_dot_)edhance(_dot_)com,
do I just add this:
www.edhance.com IN TXT "v=spf1 -all"
exactly {this dosn't stop mail comming from xxx(_at_)domain, it just enables
receivers to tell it is obviously a forgery and reject it if it does, but also
as spammer aren't so dumb it does tend to stop them trying}
thanks,
James
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