his snippet should do it. If you are denying you may want to do this in the recipient ACL after you accept postmaster and abuse addresses. Watch which servers you reject, as some legitimate senders (airlines, banks, governments) have broken rDNS on their automated senders.

Verify reverse DNS lookup of the sender's host.

deny
message Reverse DNS verification failed
!verify = reverse_host_lookup
!hosts = ${if exists{CONFDIR/local_broken_dns_whitelist}\
{CONFDIR/local_broken_dns_whitelist} {}}

I find a lot of spambots give up quickly if they don't get a connection banner quickly enough. Including the following in a connect ACL may help. Disabling pipelining catches a number of spambots that don't behave well. If the delay is too long (over 30s) some legitimate servers will also give up.

Verify reverse DNS lookup of the sender's host.

Disable piplining and delay on failure.

warn
!hosts = ${if exists{CONFDIR/local_broken_dns_whitelist}\
{CONFDIR/local_broken_dns_whitelist} {}}
!verify = reverse_host_lookup
control = no_pipelining
delay = 10s

Since 17 October, to our knowledge any email with the NewClimate URL (newclimate dot org) in the email body, link, signature, reply header or contained anywhere in an attachment is unjustifiably quarantined by Microsoft email servers without any notice, regardless of who sends or receives the email.

Test how well your mailserver delivers emails!

We test various security (DNSSEC, TLS, DANE, MTA-STS) and deliverability (IPv6) features your server should support when sending mail. (details)

Backward Incompatible Changes

This release was bumped to 2.0, not because of the magnitude of features (which is actually smaller than past releases), but because of a few changes that are backward incompatible. Please read this list carefully to be aware of these changes:

When using <attach-file> to browse and add multiple attachments to an email, you may use <quit> to exit after tagging the files. Previously, "enter" had to be pressed on a non-directory file. This was awkward and non-intuitive.
The default value of some configuration variables is translatable. Those are marked with type string (localized) in the manual. Examples include $attribution and $status_format.
$ssl_force_tls defaults set. If this sounds familiar, that's because I tried this before in the 1.13.0 release, but reverted it after some breakage. I'm trying again with a major revision number bump. If you need to connect to a non-encrypted site, you will need to turn this setting off yourself.
<decode-copy> and <decode-save> no longer perform header weeding by default. Header weeding can be toggled back on by setting $copy_decode_weed.
$hostname is set after processing the muttrc and -e command-line arguments. This was done to provide a way to skip DNS lookups of the FQDN, which on some systems can result in a delay when starting up.
$reply_to is processed before $reply_self.
Normal configuration variables (as opposed to user-defined my variables) were previously escaped when used on the right hand side of an assignment. Newline was converted to "\n", carriage return to "\r", tab to "\t", backslash and double quotes were backslash escaped. This was a bug, but a long-standing one, so I note the change here.

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Lotus Notes can be a tough Email client to test your HTML Email & newsletters against.