Hello! Please re-configure your mail server, I have experience a problem when sending mail to support@:
This message was created automatically by mail delivery software.
A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
…
554 5.7.1 <…@...pro>: Sender address rejected:
Mail from .pro not accepted
You already know this is a user forum, and if you don't use tags like @normis, @EdPa, etc.
it's unlikely the staff see it...
The problem is new extensions, like your .pro, are discarded if the mail server software isn't up to date.
Write to support@mikrotik.com from a regular email address...
Wouldn't that be quicker?
No, it’s not related up-to-date it or not. dot pro domain zone is 22 years old. It is antispam configured that way.
@normis Please fix.
Time passes... it seems like (still) yesterday...
Fact-of-life is that such domains are mainly registered by spammers and other people you do not want to receive mail from, so it is not that strange that blocking is done on them.
This was once a reasonable approach, but it's somewhat outdated. The situation is rapidly changing depending on many factors: the number of domains, ease of registration, initial cost, and other factors. I opened my spam folder, and all of the spam domains in it are .com and country-level domains like .co.uk, .au, and others. There aren't a single domain from the new GTLD in my spam folder. The spam problem is much more directly related to hosting providers, who ignore the rules and systematically send spam, essentially targeting entire subnets of IP addresses, and not all mail servers block them. And what domain is involved is far from the primary issue.
The most up-to-date information is here:
https://www.cybercrimeinfocenter.org/spam-activity-in-tlds-december-february-2026
Of course broad mail blocking (based on TLD or IP subnet for example) is based on the same bad principle as “sanctions” (mentioned in another recent topic): the idea that when a small group of people misbehave, you can hit the larger group they are part of, hoping that there will be internal revolt to clean up the situation.
Of course that usually doesn’t work, and it would be labeled “racism” in other contexts to do such things. And in the end there are innocent victims suffering for no real reason.
Removed the block, try again 
yes, until now, 100% of emails from .pro domain were spam
Submitting a ticket via the support system was always an option too.
<support@mikrotik.com>: host mailgw-a.mt.lv[159.148.147.235] said: 554 5.7.1
<x@y.name>: Sender address rejected: Mail from .name not
accepted (in reply to RCPT TO command)