When comparing temp-mail.io vs 33Mail, the Slant community recommends 33Mail for most people. In the question“What are the best temporary email address services?” 33Mail is ranked 21st while temp-mail.io is ranked 41st. The most important reason people chose 33Mail is:
You can reply to emails via 33mail without disclosing your real email address.
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Pros
Pro Mobile version
Pro Free
Pro Print email
You can print any email.
Pro Attachments
You can download attachments and see preview. Also you can download all attachments in one click.
Pro Fast
Pro Anonymous replies
You can reply to emails via 33mail without disclosing your real email address.
Pro Permanent email aliases
Email aliases aren't temporary, but they can be blocked.
Pro It's been around a while so it ain't going anywhere
33Mail started in 2011 and has been growing steadily since then, forwarding over 1m emails per month as of 2018.
Pro Your own email domain
With 33Mail you get your own domain, like dogbert.33mail.com - and you can create as many aliases as you want under this, such as slant@dogbert.33mail.com. That's with the free plan, but with the paid plan you can use your own domain name.
Cons
Con Terrible customer service, no way to stop charges if you sign up for premium
After 1 year they auto-charged for the 2nd year. There is NOWHERE on their site to remove your credit card info. You can write to them them in advance several times to please stop your premium service, but they will charge you anyway. Terrible customer service.