Does RDNS for mail server have to match the mail server hostname exactly?

Posted by threecheeseopera on Server Fault See other posts from Server Fault or by threecheeseopera
Published on 2010-06-16T17:55:31Z Indexed on 2010/06/16 18:03 UTC
Read the original article Hit count: 327

Filed under:

emailserver

|

spam

|

rdns

Typically when setting up a mail server, I create an rDNS record for the mail server IP to match the mail server hostname (ex: mail.example.com).

Can I instead set the rDNS ptr to match the parent domain (e.g. example.com), if this server is being used for multiple purposes, and still send mail successfully (i.e. not be classified as spam b/c of mismatched rDNS)?

Thanks!

EDIT: The article at http://en.wikipedia.org/wiki/Forward_Confirmed_reverse_DNS seems to indicate that it might be more complicated than I had thought. For instance, 1) I did not know that you could have multiple PTR records for a given IP; 2) it appears that as long as each PTR record matches an A record, everything is good (basically nullifying my question). Would you agree?

© Server Fault or respective owner

Related posts about emailserver

using own mail server with external domain and dns. Now have internal dns. dkim test not working

as seen on Server Fault - Search for 'Server Fault'
I am not very knowledgeable in this area, but have been able to make great head way. Now i am stuck I setup my own mail server, e.g mailbox.example.com. I had the domain dns point to my mail server in my office. i was able to set up everything working fine. such as dkim and spf records. Recently… >>> More
What exactly is a X-YMailISG header?

as seen on Server Fault - Search for 'Server Fault'
Finally ... our emails are being seen by Yahoo! not as junk anymore. Hurray! However I notice that the Yahoo! receiving MTA adds in a X-YMailISG header. It's very large ... 2**10 bits? Now that I've invested too large a chunk of my waking life in crafting our email headers I'm curious to know… >>> More
Dovecot: no auth attempts in 0 secs (IMAP protocol)

as seen on Server Fault - Search for 'Server Fault'
I'm having a lot of problems configuring dovecot ony vps. I'm already able to send email using port 110 and to receive email using port 25, but I can't connect using port 993 and 995. I'm using self-signed ssl certificates. When I try to connect to 993 this error is logged: Jun 8 19:06:39 MY_HOSTNAME… >>> More
Transfer all 1&1 web and e-mail services to own Synology NAS using No-IP for DDNS

as seen on Server Fault - Search for 'Server Fault'
I have a domain x-treem.net. The registrar is DomainDiscover and I have a hosting package with 1&1 which includes web and e-mail. I also have an additional package with 1&1 - Microsoft Exchange which centralises all my e-mails, tasks, contacts, notes, etc. and I connect to it with my PC (Outlook)… >>> More
Postfix unable to create lock file, permission denied

as seen on Server Fault - Search for 'Server Fault'
I thought I had my postfix configuration all set up on my Amazon Ubuntu server but I guess not. I'm trying to set up an admin email account for 3 virtually hosted Apache websites. Here's my postfix main.cf file: myhostname = ip-XX-XXX-XX-XXX.us-west-2.compute.internal alias_maps = hash:/etc/aliases alias_database… >>> More

Related posts about spam

spam spam spam spam [closed]

as seen on Stack Overflow - Search for 'Stack Overflow'
spam removed spam removed spam removed spam removed >>> More
Stop Outgoing Spam Already Tagged as Spam

as seen on Server Fault - Search for 'Server Fault'
Hi, I run a Postfix server with Amavis and Spamassassin among other things. Postfix receives mail from the outside world and passes it on to Amavis. Amavis has Spamassassin rate the mail, and then tags it as spam if necessary. Then Postfix relies on each users' procmailrcs to deal with the mail as… >>> More
spam check, spam score how to?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi. I am doing a app that is sending email and need to have a spam checker on the outgoing email. I have been looking for this a while now, I can not seem to find a good solution. I would like to use something like the spamassassin. Do you guys got any examples how to do the spamassassin with asp… >>> More
configure spam assassin to delete all spam above a score domain wide and override individual settin

as seen on Server Fault - Search for 'Server Fault'
Okay, so this is my scenario and what I want to try and do. I maintain a Red Hat email server running qmail and spamassassin. I have a domain that has well over 100 email account each with individual settings for spam scores and, whether or not to delete email incoming mail deemed spam. What I… >>> More
Make Thundirbird use and sync with Gmail Spam facility

as seen on Super User - Search for 'Super User'
I am using Thundirbird 3.1.7. I am using Gmail with it. When I mark a message as spam in Thunderbird, I want it to go to Gmail's spam folder. But it is not happening. The mail is only marked as spam and stays in Gmail's inbox. How can I setup Thunderbird so that when I mark a message as spam in… >>> More