Steps to follow when server is moved under new IP

[Sruli Saurymper]

Never heard ISP's blocking incoming traffic to port 25, and they CAN 
block 1 direction. to test it you can temporarily change postfix 
outbound port to something else.

On 16/12/15 07:39, protik wrote:
> Actually new ISP had port 25 blocked, so I called and requested block 
> to be removed.
> I can receive emails fine, so I called again to see if they are 
> blocking outgoing but they replied if port 25 is open then its open 
> both ways (maybe I should somehow check if outgoing port is open)
>
> As for reverse DNS then yes my domain registrar takes care of it (but 
> I'll check again).
>
> I'm confused about SSL certificate, because I don't think I use SSL 
> certificate (or at least I use self signed certificate), I'll read up 
> more about this
>
> Thanks for your help
>
>
> On Tue, Dec 15, 2015 at 11:21 PM, Sruli Saurymper <sruli at saurymper.com 
> <mailto:sruli at saurymper.com>> wrote:
>
>     SPF and reverse DNS are not a must to get outgoing to work but
>     many (maybe most?) will not accept emails from servers who do not
>     have these configured. SPF record you setup in your DNS records
>     reverse DNS you have to request from your ISP.
>     I don't know what to make of your current error, doesn't sound
>     like its linked to SFP/DNS issue, is your SSL certificate IP or
>     domain bound? now-days only domain bound certs are issued, does
>     your ISP allow sending mail on port 25?
>     I cant help you much further on this, I am sure if you find more
>     info in your log file and post someone will be able to help you.
>
>
>     On 16/12/15 07:07, protik wrote:
>
>         I have only setup kolab through wiki instructions. Mail server
>         was running for last 3 years.
>         Week back I switched ISP, I didn't change the setup.
>
>         I think SPF and reverse records are updated through dyndns (I
>         may not be correct though, let me know how to look for
>         SPF/reverse record)
>
>         After looking through /var/log/maillog
>
>         I've error like:
>
>         smtp[3002]: certificate verification failed
>
>         Regards
>
>         On Tue, Dec 15, 2015 at 10:29 PM, Sruli Saurymper
>         <sruli at saurymper.com <mailto:sruli at saurymper.com>
>         <mailto:sruli at saurymper.com <mailto:sruli at saurymper.com>>> wrote:
>
>             What problems on outgoing? are they bouncing? did you
>         update SPF,
>             reverse record?
>
>
>             On 16/12/15 05:47, protik wrote:
>
>                 Do I need to follow something specific?
>                 Outgoing mails seem to have problem, when moved to new IP
>
>                 Thanks
>
>
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