>It's rumored that AOL will silently delete mail from mail servers without
>a reverse DNS entry, so now may be the time. :)
I don't think they do that, but not having any reverse delegation for your
MTA's ip certainly weights their evaluation of whether to accept your mail
or not.
>>Will it be sufficient to set up a reverse pointer record for arriba1.net OR
>>will I ALSO need to ask my hosting customers to change their smtp to
>>something like mail.arriba1.net
It's the a) existence of delegation for the subnet of your MTA's ip b) the
PTR record for your MTA's ip.
Imail will answer with the default (non-virtual) mail hostname:
# telnet 212.73.210.73 25
Trying 212.73.210.73...
Connected to ms1.meiway.com.
Escape character is '^]'.
220 X1 NT-ESMTP Server ms1.meiway.com (IMail 6.06 298214-1)
ehlo len
250-ms1.meiway.com says hello
250-SIZE 0
250-8BITMIME
250-DSN
250-ETRN
250-AUTH LOGIN CRAM-MD5
250-AUTH=LOGIN
250 EXPN
so the PTR record should answer with that:
# dig -x 212.73.210.73
; <<>> DiG 8.3 <<>> -x
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4
;; QUERY SECTION:
;; 73.210.73.212.in-addr.arpa, type = ANY, class = IN
;; ANSWER SECTION:
73.210.73.212.in-addr.arpa. 1D IN PTR ms1.meiway.com.
PTR and A records match and ehlo/helo hostname match.
and here is our Imail's ehlo/helo hostname as seen in a policy rejection
dialog with our IMGate:
Out: 220 mgw1.MEIway.com - ESMTP - Postfix Relay Hub - ATTN: UCE trespassers
will be pursued.
In: EHLO ms1.meiway.com
Out: 250-mgw1.MEIway.com
Out: 250-PIPELINING
Out: 250-SIZE 10240000
Out: 250-ETRN
Out: 250 8BITMIME
Forget about the virtual hostnames and PTR records, Imail doesn't use them
in SMTP dialogs.
Len
http://MenAndMice.com/DNS-training
http://BIND8NT.MEIway.com : ISC BIND 8.2.4 for NT4 & W2K
http://IMGate.MEIway.com : Build free, hi-perf, anti-abuse mail gateways
Please visit http://www.ipswitch.com/support/mailing-lists.html
to be removed from this list.
An Archive of this list is available at:
http://www.mail-archive.com/imail_forum%40list.ipswitch.com/
