# Unable to install Mautic Multi Domain Plugin **URL:** \ **Category:** 3rd Party Addons\ **Tags:** community, discussion, email\ **Created:** [March 1, 2024, 2:46pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126 "2024-03-01T14:46:52Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![integration](https://avatars.discourse-cdn.com/v4/letter/i/59ef9b/32.png) [@integration](https://forum.mautic.org/u/integration)\ **Post date:** [March 1, 2024, 2:46pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/1 "2024-03-01T14:46:52Z")
Team, I have manually installed this plugin [GitHub - FriendlyDotCH/mautic-multi-domain](https://github.com/FriendlyDotCH/mautic-multi-domain?tab=readme-ov-file) and I am receiving an error when attempting to access Mautic. Could someone help me to resolve this issue? ![Repo_Issue](https://us1.discourse-cdn.com/flex020/uploads/mautic/original/2X/5/55a51bb4989ee4f0f9da31657957a069c5dcfdaa.png) ---
**Author:** ![integration](https://avatars.discourse-cdn.com/v4/letter/i/59ef9b/32.png) [@integration](https://forum.mautic.org/u/integration)\ **Post date:** [March 1, 2024, 3:10pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/2 "2024-03-01T15:10:35Z")
Currently using Mautic version: v5.0.3 PHP Version: 8.1.27 ---
**Author:** ![loki](https://avatars.discourse-cdn.com/v4/letter/l/3be4f8/32.png) [@loki](https://forum.mautic.org/u/loki)\ **Post date:** [March 1, 2024, 6:38pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/3 "2024-03-01T18:38:13Z")
Not compatible with v5. I had the same issue and as it’s a necessity for me I’ve moved to v4. ---
**Author:** ![integration](https://avatars.discourse-cdn.com/v4/letter/i/59ef9b/32.png) [@integration](https://forum.mautic.org/u/integration)\ **Post date:** [March 4, 2024, 2:00pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/4 "2024-03-04T14:00:12Z")
@loki Thanks for jumping in on this. Also, may I know which version you are using right now? ---
**Author:** ![loki](https://avatars.discourse-cdn.com/v4/letter/l/3be4f8/32.png) [@loki](https://forum.mautic.org/u/loki)\ **Post date:** [March 4, 2024, 2:15pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/5 "2024-03-04T14:15:34Z")
I’m on v4.4.11 . There are still a few issues that need to be sorted out in v5 IMO, I’m sure it will be great after a few more updates but v4.4.11 is a much smoother experience at the moment. ---
**Author:** ![integration](https://avatars.discourse-cdn.com/v4/letter/i/59ef9b/32.png) [@integration](https://forum.mautic.org/u/integration)\ **Post date:** [March 4, 2024, 5:07pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/6 "2024-03-04T17:07:13Z")
@loki, thank you for the information. I’m new to Mautic. How can I downgrade my version? Do I need to take a backup before doing that? Also, do I have to delete and reinstall Mautic? ---
**Author:** ![loki](https://avatars.discourse-cdn.com/v4/letter/l/3be4f8/32.png) [@loki](https://forum.mautic.org/u/loki)\ **Post date:** [March 4, 2024, 5:32pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/7 "2024-03-04T17:32:27Z")
I’m pretty new too. As far as I could tell there is no easy downgrade procedure, you could always try and overwrite the install files with a copy of v4.4.11 and hope for the best but I didn’t know what (if any) database changes there were between the versions so opted to set up a fresh install with a new database, basically starting from scratch. ---
**Author:** ![joeyk](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/joeyk/32/11164_2.png) [@joeyk](https://forum.mautic.org/u/joeyk)\ **Post date:** [March 5, 2024, 5:30am UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/8 "2024-03-05T05:30:17Z")
Hello! The plugin will be eventually upgraded, please be patient. We dont have a timeline for it. There is know simple way to downgrade Mautic, I suggest a reinstall. ---
**Author:** ![integration](https://avatars.discourse-cdn.com/v4/letter/i/59ef9b/32.png) [@integration](https://forum.mautic.org/u/integration)\ **Post date:** [March 13, 2024, 4:37pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/9 "2024-03-13T16:37:59Z")
@joeyk , Thank you for your inquiry. I would like to know how to handle SMTP when users are in different domains and both are using GMAIL. Could you please provide some guidance on this? ---
**Author:** ![joeyk](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/joeyk/32/11164_2.png) [@joeyk](https://forum.mautic.org/u/joeyk)\ **Post date:** [March 13, 2024, 5:41pm UTC](https://forum.mautic.org/t/unable-to-install-mautic-multi-domain-plugin/31126/10 "2024-03-13T17:41:11Z")
Hi the plugin manages multiple domain via 1 SMTP. Not Multiple SMTP via Multiple domain. Maybe this can help. I have not done this but others did. This is a postfix related issue, maybe you have more experts in a postfixc forum. > **[Postfix sender\_dependent\_relayhost\_maps](https://tapoueh.org/blog/2010/09/postfix-sender_dependent_relayhost_maps/)** > > The previous article about M-x mailq has raised several mails asking me details about the Postfix setup I’m talking about. The problem we’re trying to solve is having a local MTA to send mails, so that any old-style Unix tool just works, instead of...