You shouldn’t be using port 25 for incoming mail. It is not the standard, and just isn’t secure; that’s why it is blocked. You should use port 110 for non-SSL, or 995 for TLS (and you SHOULD use TLS always, although you need to support both).

For outgoing port 25 is for non-TLS, and 465 for TLS.

Larry




> On Apr 23, 2018, at 3:06 PM, Wglore <[log in to unmask]> wrote:
> 
> Hi all, 
>  
> Very much a newbie, got my Listserv license last week. I found out that my IP has port 25 blocked and I am being told that it will not be an option. I have set up the ListServ on a Centos 7 machine with sendmail also active. I have no problems sending emails out on port 25, but incoming emails through my IP on port 25 are blocked. I have asked my IP about it but they are telling me they have up to 5 business days to reply. My history with getting results from my IP have not been all that great. Is there an easy, reliable and non-cost way to get around the port 25 issue?
>  
> Warren Glore
> Owner
> Mid America Training
> 
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