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Protonmail address rejected
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For some reason my Protonmail email address is blocked from sending anything to my Mailbox address. The error message is "smtp; 554 5.7.1 <[redacted]@proton.me>: Sender address rejected: Access denied". What causes this?
To clarify, this seems like something Mailbox does behind the scenes and I don't have control over it, since the address is definitely not blacklisted and I've even set all spam to go to junk instead of being rejected.
The same problem 
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Hi,
thank you for your post. Your account is not yet verified, this is the reason that you can't send out e-mails to external addresses. As long as your account has no contract, you can only send e-mails to mailbox.org-addresses. We had to implement this for test-accounts, because we had so many spammers abusing our services. That means as soon as you have a paid contract, you can send out e-mails.
With kind regards
---
Felix Kaspar
Teamlead
mailbox Support
Useful Links:
Hi,
thank you for your post. Your account is not yet verified, this is the reason that you can't send out e-mails to external addresses. As long as your account has no contract, you can only send e-mails to mailbox.org-addresses. We had to implement this for test-accounts, because we had so many spammers abusing our services. That means as soon as you have a paid contract, you can send out e-mails.
With kind regards
---
Felix Kaspar
Teamlead
mailbox Support
Useful Links:
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