[GH-ISSUE #681] Recipient email id: mix up in parsing "-" (hyphen) and "_" (underscore) #1046

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opened 2026-03-14 11:34:53 +03:00 by kerem · 1 comment

kerem commented

2026-03-14 11:34:53 +03:00

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Originally created by @codebyshn on GitHub (Sep 20, 2024).
Original GitHub issue: https://github.com/anonaddy/anonaddy/issues/681

I've a verified recipient email ID in the following format: firstword_lastword@mydomain.com.

There have been failed deliveries to this recipient ID since 18th September, 2024.
Code from Failed Deliveries tab: "smtp; 550 5.1.1 User unknown"

After some investigation, here are the findings:

On the Recipients page, the "_" (underscore) character in the email ID has been replaced with "-" (hyphen). The correct email ID is firstword_lastword@mydomain.com. However, on addy.io, it has now become firstword-lastword@mydomain.com.
When I tried adding firstword_lastword@mydomain.com as a new recipient, addy.io reports the following: "Error: A recipient with that email already exists"
When I tried adding firstword-lastword@mydomain.com (this already shows up on the list of recipients) as a new recipient, addy.io reports the following: "Error: A recipient with that email already exists". Screenshot attached.

Some additional points that may be relevant

The recipient email ID is verified, has been active for more than 3 years.
This is a custom domain, and I can confirm that firstword_lastword@mydomain.com is the only correct email ID. There has never been an email ID firstword-lastword@mydomain.com

Originally created by @codebyshn on GitHub (Sep 20, 2024). Original GitHub issue: https://github.com/anonaddy/anonaddy/issues/681 I've a verified recipient email ID in the following format: firstword_lastword@mydomain.com. There have been failed deliveries to this recipient ID since 18th September, 2024. Code from Failed Deliveries tab: "_smtp; 550 5.1.1 <recipient email ID> User unknown_" After some investigation, here are the findings: 1. On the Recipients page, the "_" (underscore) character in the email ID has been replaced with "-" (hyphen). The correct email ID is firstword_lastword@mydomain.com. However, on addy.io, it has now become firstword-lastword@mydomain.com. 2. When I tried adding firstword_lastword@mydomain.com as a new recipient, addy.io reports the following: "Error: A recipient with that email already exists" 3. When I tried adding firstword-lastword@mydomain.com (this already shows up on the list of recipients) as a new recipient, addy.io reports the following: "_Error: A recipient with that email already exists_". Screenshot attached. Some additional points that may be relevant 1. The recipient email ID is verified, has been active for more than 3 years. 4. This is a custom domain, and I can confirm that firstword_lastword@mydomain.com is the only correct email ID. There has never been an email ID firstword-lastword@mydomain.com ![Screenshot from 2024-09-20 23-53-32](https://github.com/user-attachments/assets/faa55816-ff6f-415b-81d2-a990274f378f)

kerem closed this issue

2026-03-14 11:34:59 +03:00

kerem commented

2026-03-14 11:35:04 +03:00

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@willbrowningme commented on GitHub (Sep 24, 2024):

Resolved via email.

@willbrowningme commented on GitHub (Sep 24, 2024): Resolved via email.

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starred/anonaddy#1046

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