There are some smart guys on the Mailinator Mailing list but I don't believe they are creating a secure mail address. It appears to me that they have not given enough time to develop a secure Mailinator service. I believe it's a very good idea to make a mail service that is as simple as possible and secure. Mailinator is not secure, not because it's a startup company but because the basic concept is flawed.
As it's usual for startups, the Mailinator site is not completely secure. The main weakness is that if you get a directory name like'mailinator.com/mail/username' you can try to directly connect to the site over port 80 (HTTP traffic) using the Mailinator site, which will eventually connect to the correct domain and give you the requested account.
It's a common misconception that sending email is a hard thing, and that sending email is a problem solvable only by some super-smart nerds. I think Mailinator as a concept is hugely interesting and would be amazing if it would be more popular, it provides great service to people with a lot of time and effort to spare.
EDIT: After discussion with Mailinator team, I have opened a support ticket for this and it is being tracked in this thread:https://community.mailinator.com/t5/Mailinator/Sender-Score-increases/td-p/143024
UPDATE: I have contacted Mailinator team and it is now being looked into. The problem was the incorrect header in the message being received at mailinator.com and the reason for the lower score was the incorrect header in the message being received at mailinator.com and the reason for the lower score was the incorrect header in the message being received at maildrop.cc. The score should increase on the point that it is higher than if it was sent directly to smtp.mailinator.com. Mailinator team is working on a fix for this issue. In the meantime, please use the same SMTP server to send email to mailinator.com.
You can enter up to three addresses and a password, since this is a sandbox, you do not need to enter a username. If you wish to use a mailinator address, you can do so, however your username and password will be required during sandbox authorizations.
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