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Q&A How can one disable the default Reply-To address when Thunderbird sends to a specific domain?

Context When I send new mail from my destination (.*@PM\.me) address, having a default Reply-To set, as file://$HOME/.thunderbird/l96s5pce.default-esr/prefs.js#:~:text=user_pref("mail.identity.id1...

0 answers  ·  posted 4mo ago by Mr. Beedell, Roke Julian Lockhart (RJLB)‭  ·  edited 4mo ago by Michael‭

Question email thunderbird
#3: Post edited by user avatar Michael‭ · 2026-06-03T19:58:31Z (4 months ago)
Clarify (and de-caps) the title
  • How One Can Use A Default Reply-To Address, When Sending Mail, But Not Have TB Apply It When Sending Mail To A Specific Domain
  • How can one disable the default Reply-To address when Thunderbird sends to a specific domain?
#### Context

When I send *new* mail from my destination (`.*@PM\.me`) address, having a default `Reply-To` set, as `file://$HOME/.thunderbird/l96s5pce.default-esr/prefs.js#:~:text=user_pref("mail.identity.id1.reply_to", "[email protected]");`, is useful, so that recipients respond to my desired alias, rather than my destination address. It's somewhat like a security fallback.

However, when responding to messages sent to an alias, that static, default `Reply-To` address can be problematic, because it overrides otherwise-inherit `Reply-To` that `$alias_local_part+$recipient_local_part=$recipient_domain_part@rokejulianlockhart.addy.io` provides. [^1]

[^1]: [`github.com/anonaddy/anonaddy/issues/876`](https://github.com/anonaddy/anonaddy/issues/876#issue-4524044570)

#### The Question

Consequently, how can I enter a default `Reply-To` address, for when I send mail, but not have Thunderbird automatically apply it when I respond/send to mail from a specific domain?
#2: Post edited by user avatar Mr. Beedell, Roke Julian Lockhart (RJLB)‭ · 2026-05-26T12:36:55Z (4 months ago)
  • How can I use a default Reply-To address, when I send mail, but not have TB apply it when I respond/send to mail from a specific domain?
  • How One Can Use A Default Reply-To Address, When Sending Mail, But Not Have TB Apply It When Sending Mail To A Specific Domain
#1: Initial revision by user avatar Mr. Beedell, Roke Julian Lockhart (RJLB)‭ · 2026-05-26T12:35:41Z (4 months ago)
How can I use a default Reply-To address, when I send mail, but not have TB apply it when I respond/send to mail from a specific domain?
#### Context

When I send *new* mail from my destination (`.*@PM\.me`) address, having a default `Reply-To` set, as `file://$HOME/.thunderbird/l96s5pce.default-esr/prefs.js#:~:text=user_pref("mail.identity.id1.reply_to", "[email protected]");`, is useful, so that recipients respond to my desired alias, rather than my destination address. It's somewhat like a security fallback.

However, when responding to messages sent to an alias, that static, default `Reply-To` address can be problematic, because it overrides otherwise-inherit `Reply-To` that `$alias_local_part+$recipient_local_part=$recipient_domain_part@rokejulianlockhart.addy.io` provides. [^1]

[^1]: [`github.com/anonaddy/anonaddy/issues/876`](https://github.com/anonaddy/anonaddy/issues/876#issue-4524044570)

#### The Question

Consequently, how can I enter a default `Reply-To` address, for when I send mail, but not have Thunderbird automatically apply it when I respond/send to mail from a specific domain?