Login/verification emails never delivered — address appears to be on the email suppression list

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Login and verification emails are never delivered to my account's email address (a personal Posteo mailbox). I have checked server-side in my provider's webmail — inbox, spam, and quarantine — repeatedly over several days. Nothing ever arrives. This blocks logging in to claude.ai and Claude Code on any new device or session.

Crucially, a second email address I own on a different provider (iCloud) receives Claude login codes reliably from the exact same device and network. So this is specific to my Posteo address — not a provider-wide block, and not local filtering on my end. My provider does not reject or filter mail from @mail.anthropic.com (already whitelisted).

All evidence points to my Posteo address being on Anthropic's email suppression list, most likely from a past transient bounce. The Fin support bot has confirmed it cannot view or modify the suppression list and has no path to escalate to a human.

Request: please have someone remove my address from the email suppression list so login codes can be delivered again. I have an active session and can verify account ownership, and I can share the exact address through any private channel.

What Should Happen?

Login/verification emails should be delivered to my account address. The address should not remain on the suppression list long after the original bounce condition has been resolved.

Error Messages/Logs

Steps to Reproduce

1. On the login screen, enter my Posteo account address and request a login code.
2. Wait, then check webmail server-side (inbox / spam / quarantine). No email arrives — repeated over several days.
3. Enter a second address I own on a different provider on the same device and network → login code arrives normally.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.163

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

macOS · claude.ai and Claude Code · personal (non-institutional) email account.