[CentOS] Does SMTP Connection Drop When Posfix Reload is Issued ?

[Earl Ramirez]

On 25 April 2012 07:42, Prabhpal S. Mavi <prabhpal at digital-infotech.net>wrote:

> Dear Community Friends Greetings,
>
> i work with ISP, we host email service for almost 500+ companies and 200+
> mail servers relay through my smart host.
>
> i implemented something that when our smart host would become blacklisted.
> It will automatic switch to next available smart host (which is ready
> sitting). that mean it will start relaying message through another smart
> host automatically.
>
> i think i must tell little background as well. it is actually php script
> that perform blacklist check every minute through cron. if it found that
> IP is blacklisted. It will then insert "relay host =" value in main.cf and
> reload postfix service. When IP is no more blacklisted it will then remove
> the same directive from main.cf and reload postfix.
>
> everything is working as expected. i have one question, when we reload
> postfix does it drop active SMTP session?
>
> for example lets say that remote SMTP server is delivering message to my
> postfix that has 8MB attachment. message was not fully transferred. lets
> say that 4MB was transferred. and i issued "postfix reload". will that
> connection drop or continue to deliver the mail?
>
>
> Thanks / Regards
> Prabhpal S. Mavi
>
>
>
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Postfix reload will not disrupt any connection and in your example the mail
will continue to be delivered

-- 
Kind Regards
Earl Ramirez