Léirmheas ar Mail Merge le Calliope
Rated 5 out of 5 stars
A very clever and reliable extension I use every few months or so. It works perfectly for me and it's usually the first add-on I install on new machines with Thunderbird on them.
As another user pointed out, the ms-dos comma separated format works best.
And there are dozens of variables you can use in your multi-recipient mails which is very useful.
Chun do bhailiúcháin féin a chruthú, ní mór cuntas Breiseáin Mozilla a bheith agat.