I confirm the workaround presented by Seb: I disabled photographs in the message preview and had no more 'Formatting message' deadlocks (Edit -> Preferences -> Mail Preferences -> Headers -> Show the photograph of sender in the message preview).
There is a related bug filed in Bugzilla: Bug #578577 - deadlock in contact image lookup leading to evo hang formatting message (https://bugzilla.gnome.org/show_bug.cgi?id=578577). ** Bug watch added: GNOME Bug Tracker #578577 https://bugzilla.gnome.org/show_bug.cgi?id=578577 -- Evolution hangs with "Formatting Message" after several hours https://bugs.launchpad.net/bugs/175233 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
