we have a mailserver available for use on request.
incoming:
mail.tvirtas.com
993, (SSL/TLS)
outgoing:
mail.tvirtas.com
587 (STARTTLS)
username (both fields): (name)@tvirtas.com
contact us to get an account. to make your message easier to read through, you could word it like this (not required, but encouraged):
"i would like the mailbox (yourchoicehere@tvirtas.com). i swear in good faith that i will not use this as a method to upload or distribute any malicious or illegal files or information."
Thunderbird is a good desktop client. on mobile, you can use Gmail.