Currently we get a 150 character excerpt of the message left on our talkpage, in the emailed Notification. (or 0 characters, if it isn't signed properly, per T59152)
An editor has suggested that for this particular type of email-notification, the entire new message should be included, or at least a longer excerpt.
(Short discussion about it at https://www.mediawiki.org/wiki/Topic:Rqxynllw93ey6li9 )
Version: unspecified
Severity: normal