Even the free plan has 1 GB storage (not extremely much, but not bad neither), up to 25MB attachments, and 24/7 support:
https://www.memail.com/pricing
It does say "limited time offer" below the "free". How limited is that exactly? And will the people signing up for free keep a free version?
Also, how long has this provider been around? Backed up by a solid business plan or sponsor?