pop 110/995, imap 143/993 ?

[Sebastian Arcus]

On 21/08/17 13:39, Robert Wolf wrote:
> 
> On Mon, 21 Aug 2017, Sebastian Arcus wrote:
> 
>>
>> On 21/08/17 10:37, Gedalya wrote:
>>> On 08/21/2017 07:28 AM, voytek at sbt.net.au wrote:
>>>> is there a 'preferred way'?  should I tell users to use 143 over 993 ? or
>>>> 993 over 143? or?
>>> There is no concrete answer. There are various opinions and feelings about
>>> this.
>>> The opinion againt 993/995 is that these are not standard ports,
>>
>> Out of curiosity, is there a source for this? It's the first time I hear that
>> 993/995 are not standard ports - and searching on the Internet, I can't find
>> any evidence to back it up? Also, pretty much all email software has been
>> using them for the past 20 years or so. It seems like a curiously high rate of
>> adoption for a non-standard :-)
> 
> 
> Hello,
> 
> IMHO the "not standard ports" is meant as "old, useless ports now".

So in short, ports 993/995 are IANA officially approved, and thus 
"standard". Further to this, they are in use by the vast majority of 
email providers, and as far as I can tell, there are no functional or 
security disadvantages to using SSL over 993/995 - instead of STARTTLS 
over 110/143.