Hello there!
I am Belgian, 34 years old, I have about 15 years of professional experience in IT, I have been working with Nestle, Ozone, LAN10, tour & taxis, where I have installed and managed many linux and windows servers.
I have done this countless of times, and I have actually done this no later than last week, the client was very happy, you can check on my reviews, I would setup a complete virtual domains/users email server, using postfix and a mysql database, so you can easily add/remove users, forwardings etc..
I would install spamassassin, amavis and clamav, with pyzor razor and DCC for the antispam.
For the webmail I can install squirrelmail and/or roundcube, it all goes with pop3 and imap4 of course, with SSL encryption.
I will guide you to setup your domain (MX, SPF..)
The default send limit of postfix is 100 email at once but I know how to change it (I have done this already)
No problem to send email from wordpress, I have already configured many wordpress hostings..
I have already all the procedures to add domains/users written, I am available almost immediately, on freelancer or skype or google hangouts..
I am really looking forward to work on this project, thank you!