Failed to send share by email

[pfrauchiger]

Nextcloud version: 16.0.4
Operating system and version: Ubuntu 18.04 LTS
Apache version: 2.4.29
PHP version: 7.2.19

The issue you are facing:
When I try to share a file to an external Email address I get the error “Failed to send share by mail”

The SMTP configuration is alright. Testmail works and password forget function sends a mail to the user.
Sharing to internal users works.

User Auth is LDAP.

Steps to replicate it:

1. Create file
2. Klick on share button
3. Enter external Email address

The output of your Nextcloud log in Admin > Logging:

https://pastebin.com/YZQ7BbdF

The output of your config.php file in /path/to/nextcloud:

https://pastebin.com/me1MDZjQ

The output of your Apache system log:

https://pastebin.com/ia4EFciz

[JimmyKater]

quick question: have you enabled app social sharing via email?

[pfrauchiger]

No and it’s not downloaded either.

[JimmyKater]

the official name of it is: share by mail and Social sharing via email. both are official apps which should be provided automatically.

[pfrauchiger]

I downloaded and activated social sharing via email (share by mail was already active) but I still get the same error. Do you have another idea what could be causing the error?

[eremelius]

@JimmyKater

app social sharing via email

I am having the same issue. Share by email worked until about 2 weeks ago. Now my users have to copy the link and share via Outlook

[Lofwyr]

We are also seeing this issue. Same versions and installation options.
Actually, some more looking around gave this thread which fixed my issues for now:

Problems with federated shares and permissions/resharing

Nextcloud version : 16.0.5.1 and 16.0.4.1 (first item is the instance on webhosting, the second on the dedicated storage box from hetzner) Operating system and version : webhosting and storage box at hetzner.com Apache or nginx version : nginx, i think current stable version on both boxes PHP version : 7.3.10 and 7.3.9 The issue you are facing: I can create federated shares between users on both servers. i also see the sharing menu on the shares with the target users. but I’m not able to re…

Still waiting for a real fix though.

[problemator]

Is the Nextcloud team aware of this, and is there a bug report? This is affecting my production instance.

[estryzek]

The problem I had found is after updating NextCloud, 16.0.* it looks like the config may have not converted correctly

in the log under settings was showing .

sharebymail	Swift_RfcComplianceException: Address in mailbox given [Filebox@*******.com@localhost.localdomain] does not comply with RFC 2822, 3.6.2.

So to resolve this problem I changed:

Under basic setting I did find that the from email address had been filled in with the completed name@domain.com and the domain field had been filled in with the domain only.

After correcting this it was fine.

Not sure if this is or was your problem but Seeing I am not seeing a real answer to this problem. I am posting what I had to do to fix this same problem you had described.