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SirHumphreyAppleby
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  #2056047 14-Jul-2018 08:32
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jarledb:

 

Only if the DNS work. If you are doing DNS from in-house as well and someone cuts off your internet service, your email will start to hard bounce.

 

 

This isn't necessarily true. A name error (3) is only meaningful if it comes from an authoritative name server. If the DNS server is offline, the requesting DNS server should also return server failure (2) if the designated name server does not respond. An SMTP server should never give up on delivery if the DNS lookup simply fails. If I try to send mail to 'extra.co.nz', which exists but doesn't have MX, A or AAAA records, my server will quite happily keep retrying delivery until the message is expired form the queue. That would be similar to the DNS simply being offline for a while, or a temporary misconfiguration of the domain. If I send to a domain that doesn't exist at all, I will get an immediate notification and the mail will be removed from the queue.

 

 


 
 
 

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gehenna
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  #2056089 14-Jul-2018 10:12
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jarledb:

Bteam:


To answer the question why do email in house, "It works" and has done so for about 20 years.



Some questions I would ponder if I was you:


How well does it work when it comes to spam and virus filtering?


How well does it work when it comes to delivery of the email?


How well does it work when it comes to keeping the box updated (OS, and all other systems on the server), securing the mail server from hacking etc?


 



Also how well does it protect you from ransomware

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