On 3/12/2021 8:08 AM, poindexter FORTRAN wrote:
>> You will want to configure at least your SPF record.  If you're hosting
>> from your home connection, your options are really limited.  Usually
>> you would also want your reverse dns for your IP to match your hostname
>> for your MX record for your mail server.
> 
> There's a great site I use called MXtoolbox.com that helps diagnose mail
> server problems.

Well, their sales tactics are kind of strong armed and their paid 
accounts are way more than I'm willing to spend on this, roughly 10-20x 
what a relay service would cost.

Of the 4 rbls that were flagged, two were false positives that weren't 
listed on the actual rbl sites, one I was able to request automated 
deletion and for the last, I went ahead and paid for 2 years of 
whitelisting (www.whitelisted.org), mostly flagged because of the host
provider's address block (DigitalOcean).

> I just resurrected a VPS I've been holding onto for a couple of years, and
> loaded postfix from package. I added SPF and DKIM records, and the DKIM
> record seemed to do the trick to allow mail to pass to google.
> 
> I was able to find instructions on both online with google searches.

Yeah, I have DKIM and SPF setup correctly... google delivers fine, 
didn't test yahoo mail, office365 is delivering without issue... but 
hotmail/outlook.com has a separate infrastructure that's been 
problematic, I only paid for the 2-year whitelist as if that gets me to 
my outlook.com email, I'll just leave it as-is and won't need a relay 
service.

For reference, I'm using https://mailu.io/1.7/ via Docker using a 
postgresql database.  Was actually super easy to setup/configure, 
biggest issue seems to be the DigitalOcean list...

It does seem that Azure might be your best bet for hosting an MTA 
server, as their address blocks are pretty much clean.  But the host 
pricing it about 30-40% higher than DigitalOcean.

B2S (General Compute, 2cpu, 4gb) is $21/month on a reserved instance for 
a year, and $32 on a monthly.  Buying 3-year reserved instance would be 
about $500 for the three years, and from experience about $5-10/month 
for bandwidth and storage by the end of the term.

I might have been able to stick with sqlite and a 2gb service (the 
anti-spam configuration recommends at least 1gb just for the anti-spam, 
so 2gb is probably the lowest memory), adding postgresql in the mix 
recommends 2gb by itself... so just went that direction.
-- 
Michael J. Ryan - tracker1@roughneckbbs.com
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