As mentioned in other comments, forwardemail.net is a solution.
I don't know if it's a good solution.
It has recently been frequently listed on blacklists.
See screenshot (sceenshot from : mxtoolbox.com)
(If a mail server is on a blacklist, there is a good chance that your emails will end up in spam, depending on the authority of the blacklist)
Forwardemail.net has 2 competitors to my knowledge:
The forwardmx.net mail servers don't have a great history yet on mxtoolbox.com, but they are also currently blacklisted (see screenshot).
The mail servers of improvmx.com do have a great history at mxtoolbox.com, they were frequently on blacklists until 2021, but not since then.
Although it is not entirely clear whether mxtoolbox.com may have stopped monitoring this mail server in 2022.
So currently improvmx.com comes out best in this small test (only looking at email delivery at email forwarders)
Some things to add to this post:
Both impovmx.com and forwardmx.net are apparently only (past or currently) blacklisted by UCEPROTECTL3.
UCEPROTECTL3 has a very dubious reputation and I don't think any major email server uses it.
Forwardemail.net is and has been blacklisted by several other SPAM lists in the past.
I don't know if these SPAM lists have authority.
I've had issues with email delivery through Forwardemail.net in the past.
They were then blacklisted by Hostkarma, but my SPF was also set incorrectly, so I don't know what was the deciding factor.
I have been in contact with Forwardmx and Forwardemail.net support.
The support of Forwardmx is very good, fast and clear.
Forwardemail.net comes across as a bit short and frustrated, but also responds very quickly.
I am a customer of Forwardmx and Forwardemail.net and am also testing the free version of impovmx.com.
I have to say that I currently prefer Forwardemail.net.
They are well priced, have very friendly and clear support and you get an SMTP server.