Question about domain redirection and cold emailing

Hi guys. If my main website domain name is lets say and i use for cold emailing a similar domain, let’s say, is it ok that i set up a domain redirection from to ? I mean, won’t it hurt my main domain ( reputation if i redirect people from to Let me know please!

If you could get another domain for cold emailing it would be better

If you are too spammy and the Website will be indexed somewhere then yes it will hurt.
If the Page has Backlinks that are good and you do a redirect that could be good for the page.
But I guess because you cold email people you should do that in a quarantined environment