Sender address was invalid : IDN Domain issue?

Hello.

I can receive mail, but cannot send.

Got the correct settings verified by the email hosting provider (One.com).

I can successfully send emails using another email client, as long as it's not the default Mail app.

I, and the CSR from One.com, suspect this is an issue due to me having an IDN, and possibly having to do with not making sure the address is in punycode in the email headers.

In what way can I get this resolved?

[Personal Information Edited by Moderator]

iPhone 13 Pro

Posted on May 8, 2023 5:55 AM

Top-ranking reply

Robert Olding

Level 1

68 points

Posted on Aug 8, 2023 8:25 PM

A few months ago, I started having issues sending emails with Apple Mail via Zoho email accounts on my iPhone. This drove me nuts since it worked just fine on my MacBook and iMac. After constantly checking the IMAP and SMTP server settings in the Mail settings on my iPhone, which were set up correctly according to Zoho. The advice of a user in Reddit pointed me in the right direction.

I went to the iCloud Mail settings on my iPhone and scrolled to the bottom, where I found the "OUTGOING MAIL SERVER" SMTP iCloud SMTP Server. Not only was the iCloud SMTP Server in there, but to my surprise, so was the Zoho SMTP server for my custom email domain – and it was turned off! After turning it on, everything was back to normal and my custom domain emails started sending again.

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Sender address was invalid : IDN Domain issue?

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