Daniel, Yahoo change the connection settings for apps. So, I test this way: -remove yahoo account in seamonkey. -create an application password in the webmail yahoo -create again my yahoo account like this (find on : https://support.mozilla.org/en-US/kb/thunderbird-and-yahoo ) But it not resolve my pb.
So I downgrad SM to 2.49.5: it's ok (with normal encryption). Thanks very much for your help. _______________________________________________ support-seamonkey mailing list [email protected] https://lists.mozilla.org/listinfo/support-seamonkey

