Custom addition to subscribers' email addresses

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I've been using listmonk for a few months now and everything is fine, thanks for the cool product.

I have some technical email addresses, they look like this: aos395guwpvubfsdtxy~zxka3o1mm+h3maj2.3ar@proxy.tech.net
Sometimes I send emails to them to check their functionality, I need the first part of the address to change every day, so that it would look something like this
aos395[random-string]~zxka3o1mm+h3maj2.3ar@proxy.tech.net maybe there are some ideas on how I can implement this, I use my Postal server to send emails.