“… surely using mail submission (port 587 or 465…”
With SES, most definitely - but not a big deal…if my own server, can
literally use any port I want…
“…mandatory TLS encryption and authentication and DKIM signatures
added with "d=amazonses.com”)…”
Most definitely - just prudent…
“…published a SPF record in DNS for leding.net which explicitly
declares that your mail may legitimately be coming out of SES…”
Again, very true - which is exactly what people should be doing - at
least with their own domains. I know some may opt to not use SPF but
given that more and more admins are requiring SPF checks for all inbound
mail, just foolish not to have it…
- - -
On 24 Jul 2021, at 20:59, Bill Cole wrote:
On 2021-07-24 at 23:03:04 UTC-0400 (Sun, 25 Jul 2021 03:03:04 +0000)
Antonio Leding <mailmate@lists.freron.com>
is rumored to have said:
“…not feasible to send mail claiming to be from a particular
address through any arbitrarily chosen mail server…”
Mostly true but there’s ways around such hindrances…
https://www.wpoven.com/blog/free-smtp-servers-sending-emails/
All of those require you to set up accounts with the providers in
question. For example, you cannot simply decide to route your mail
through Google's mail servers without having a Google account and
configuring it to allow you to send mail using that account with
sender addresses that are not hosted at Google.
So: not quite "arbitrarily chosen."
I haven’t used any of my “assigned” SMTP servers since 2000.
And since 2013, been using a combo of Amazon’s SES or my own
Postfix…the latter is especially nice if one wants to use a
non-standard port...
Sure, but you are almost surely using mail submission (port 587 or
465, with mandatory TLS encryption and authentication and DKIM
signatures added with "d=amazonses.com") and you have published a SPF
record in DNS for leding.net which explicitly declares that your mail
may legitimately be coming out of SES.
Back before spam was a problem, it was possible to submit mail without
authentication through nearly all SMTP servers, using whatever
envelope sender and/or From address you felt like using with any
server. This has evolved over time to the current situation where
authentication (and hence server-specific account setup) is almost
universally required along with TLS encryption. Some mail clients
(including, at least in the past, Apple Mail) have configured
submission (i.e. SMTP-like) servers independently of IMAP accounts and
allowed users to arbitrarily select which outbound path to use with
each message, regardless of which sender address is used. That is not
generally safe today, but it was once entirely reasonable.
- - -
On 24 Jul 2021, at 19:47, Bill Cole wrote:
On 2021-07-24 at 21:15:55 UTC-0400 (Sat, 24 Jul 2021 18:15:55 -0700)
Ralph Alvy <mailmate@lists.freron.com>
is rumored to have said:
If I have more than one Source Acct, how do I tell Mailmate with
SMTP server to use for outgoing mail?
Each account has its own exclusive SMTP Server settings. This is
good because on the modern Internet, it is not feasible to send mail
claiming to be from a particular address through any arbitrarily
chosen mail server. It might work, but more likely your mail would
be rejected or worse: dropped silently.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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