We have trouble with some invitations.

UserA has full access to UserB's Calendar for public events.

When UserA send invitation to participants, when they answer to UserA, the message could not be delivered:

<"mailto:UserA"@company.com>: host 10.X.Y.Z[10.X.Y.Z]
said: 550 5.1.1 <mailto:userA@company.com>: Recipient
address rejected: User unknown in local recipient table (in reply to RCPT
TO command)

Note the "mailto:" string and the quote in the email address !

All other invitation works perfectly...

We use SOGo 3.1.4 on Debian and it's done with Thunderbird 38.7.0.

Other tests :
With the webmail (SOGo 3.1.4 and 3.1.5), we don't have the problem.

With Thunderbird 38.7.0 and 45.3.0 on SOGo 3.1.5, we have the problem...

I don't know if the problem is with SOGO Connector, Integrator or Lightning...