Can you use the same domain/username for different fediverse services?

Submitted ⁨⁨10⁩ ⁨months⁩ ago⁩ by ⁨muntedcrocodile@lemmy.world⁩ to ⁨fediverse@lemmy.world⁩

Is there a way to set it up so user@example.com can be a lemmy account and also a mastadon account? I seen people using subdomains like user@lemmy.example.com and user@mastadon.example.com is this nessasary? Could u also set up a matrix account with the same user@example.com? If not what woukd be requured to change to make this possible?

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thisisawayoflife@lemmy.world ⁨10⁩ ⁨months⁩ ago
You do it via a webfinger. But the service itself has to request a specific resource in order to route it correctly. For example, mastodon and pixelfed ask for the same resource, so both services will end up getting the same service’s account.

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- muntedcrocodile@lemmy.world ⁨10⁩ ⁨months⁩ ago
  Has anyone actually done it? I cant seem to find any decent guides on how to do it?
  
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  - thisisawayoflife@lemmy.world ⁨10⁩ ⁨months⁩ ago
    Reach fediverse service is different. Matrix has it’s own webfinger configuration, as does diaspora, and mastodon. However, it looks like all ActivityPub services use the same webfinger configuration, which means that this method doesn’t work for donations trying to reference user@domain.tld for activitypub. I would presume that the first AP service you have listed in the response is going to be the account that each AP service will federate with.
    
    Here’s a little bit about what I’m talking about:
    
    hanselman.com/…/use-your-own-user-domain-for-mast…
    
    github.com/pixelfed/pixelfed/issues/3563
    
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stinerman@midwest.social ⁨10⁩ ⁨months⁩ ago
No, not in the example that you’ve set up. The username is always @user@domain. This is like asking if you can have the same email address on Gmail and Hotmail or whatever. You can have the same user part, but not the domain.

People that have used user@x.domain and also user@y.domain is allowed because they’re different domain names.

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- wander1236@sh.itjust.works ⁨10⁩ ⁨months⁩ ago
  Technically you sort of can do that with email. Most providers let you verify you own the other email and then use the other provider’s SMTP to send from a different address.
  
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- muntedcrocodile@lemmy.world ⁨10⁩ ⁨months⁩ ago
  So u cant just do some weird routing rules and make it work.
  
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skullgiver@popplesburger.hilciferous.nl ⁨10⁩ ⁨months⁩ ago
[deleted]
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- muntedcrocodile@lemmy.world ⁨10⁩ ⁨months⁩ ago
  Thank you for the very detailed explanation. I figured for services using a different protocal would be easyer as they can be handled almost independantly.
  
  Would i need to modify the code of every services to man in the middle myself surly since i control the private key i can just do it after it leaves the service then if i pipe that back to my “universal” incoming it would distribute it to the relevent services?
  
  I dont understand why the last approach breaks mastadon-lemmy interaction? It seems like the best solution if it wasnt for that.
  
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bogdugg@sh.itjust.works ⁨10⁩ ⁨months⁩ ago
I don’t know if there’s a service that provides both functions. I’m sure there’s a way to do it - Lemmy posts are already accessible through Mastodon. Currently, I assume you would need the instance itself to offer both services under one account.

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- muntedcrocodile@lemmy.world ⁨10⁩ ⁨months⁩ ago
  Well i recently got myself a new server and domain and was going to self host all my things though it would be cool to have the same username and domain across services without needing to do subdomain shenanigans.
  
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