Hi Noel,

example.com listed in main.conf here is entries, after listing relay_domains, i 
can see maillog, mailhub starts relaying to  old primary mail server.

mydomain = example.com
mydestination = $myhostname, localhost.$mydomain, mailhub.example.com
relay_domains = $mydomain

As you suggested i will  check DNS TTL 

So we can pull mails  from old mail server till priority level updates?

Thanks for suggestions.

Regards,
Ramesh




--- On Tue, 11/1/11, Noel Jones <njo...@megan.vbhcs.org> wrote:

From: Noel Jones <njo...@megan.vbhcs.org>
Subject: Re: MX Priority
To: postfix-users@postfix.org
Date: Tuesday, 11 January, 2011, 10:54 AM

On 1/10/2011 11:13 PM, Ramesh wrote:
>
> Hi,
>
> I have few queries about changing mail priority level. presently we have 
> taking mail service from mail service provider, we want to bring up our own 
> mail server as primary.
>
>   mx entries
>
> example.com mail is handled by 0 example.com.
> example.com mail is handled by 10 mailhub.example.com.
>
> Yesterday i've changed priority 0 to 20, making mailhub as lowest priority 
> 10, primary mail server for example.com
>
> when i send mail to x...@example.com  from yahoo
> maillog in mailhub shows 554 5.7.1 (Relay access denied) but i can send mail 
> from mailhub through webmail.
>

"relay access denied" means that example.com is not listed in 
mydestination, virtual_domains, virtual_alias_domains, or 
relay_domains.  Postfix doesn't think it's responsible for 
that domain.


> I would like to know...
> 1)If we change mx priority, how much time it will take to update priority 
> level?

Depends on your DNS TTL and if the remote site has your 
records cached.  Anywhere from a couple minutes to a couple 
weeks for sites that have the old records cached.  No delay 
for sites that don't have your records cached.


> 2)If it takes more time during this period where new mails queued?

Mail will be sent to the old primary if that's what remote 
sites have cached.

>
> Please suggest me things to follow for migrating primary to secondary mail 
> server.

It's customary to reduce your DNS TTL a few days prior to 
planned changes.


>
> Thanks and Regards,
> Ramesh
>



    -- Noel Jones


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