Sending mail, both replies and new messages, is available only if you have an account and are logged in. It takes a few seconds to create an account.
You can send from mailsac.com or your owned domains
You can send from any unowned address @mailsac.com, or send from your account’s owned domains.
If somebody owns an email address, you will not be able to send mail as that address. Thus, to prevent other people from sending messages as your favorite address, you can make that address private.
Sending from a custom domain
First verify ownership of your domain to send from your custom domain.
Sent messages are not saved
Outgoing messages are not saved. They may be visible or cached temporarily by our outgoing mail services, and logged in debugging messages on Mailsac servers, but not explicitly archived by Mailsac at this time.