• Open Address Book
• select the address book containing the contact.
• select contact, so you see their contact details in the lower part of Contact Pane.
• You should see Email and Additional email. click on the additional email to open a new Write message using that email address in a TO field.

Hello, this suggested solution is ok to send a message to one by one contact. If I need to send a message to many contacts at the same time, this it's not efficient. This is what I mean : If I open a "new message" and the "contact panel" which is on the left side, I can see only 2 columns with "name" and "main adress". At this time I can't see the culumn with "Additional emails" and I can add it... which would be very convenient Regards Many thanks Birdee

Hello, this suggested solution is ok to send a message to one by one contact. If I need to send a message to many contacts at the same time, this it's not efficient. This is what I mean : If I open a "new message" and the "contact panel" which is on the left side, I can see only 2 columns with "name" and "main adress". At this time I can't see the culumn with "Additional emails" and I can add it... which would be very convenient Regards Many thanks Birdee

I think the only way to have additional emails displayed in the Contacts sidebar would be to create duplicates of the contacts with multiple addresses, with a different address in the Email field ("main address"). Creating duplicates is made easier if you install MoreFunctionsForAddressBook, as it adds an 'Edit as new' command to the contact right-click menu. This add-on also allows 5 additional addresses for each contact.

You could also ask the add-on developer to allow an 'Additional email' column in the Contacts sidebar.

Another workaround would be to start typing the contact's name in the To: box and allow the autocomplete search to suggest the 'Additional email' address.

sfhowes:

I looked at the addon

• https://addons.mozilla.org/en-us/thunderbird/addon/contacts-sidebar/

which would offer this, but it seems from comments that it is no longer working on recent versions. I cannot see how to contact the developer on whether he intends to update this addon.

I installed a pre-release version of Contacts Sidebar in TB 31 (should work on TB > 14) and it seems to work properly. The 'Additional email' column can be displayed, and messages can be addressed to multiple contacts by selecting from the right-click menu.

Hello Sfhowes thanks you for your answer, but unfortunately the pre-release version of Contacts Sidebardoesn't work with TB 24.5.0 !

Hello Sfhowes thanks you for your answer, but unfortunately the pre-release version of Contacts Sidebardoesn't work with TB 24.5.0 !

Hello sfhowes MoreFunctionsForAddressBook could be a solution, I installed it and I can indeed easily duplicate contacts with an alternate address. It's a bit long because I have a lot of contacts! Thank you for the tip. I will indeed contact the add-on developer to allow an 'Additional email' column in the Contacts sidebar. Thanks a lot Birdee

Where could I contact the add-on developer to allow an 'Additional email' column in the Contacts sidebar ? (what is the link to reach therm ?) Regards Birdee

Contacts Sidebar installs and runs in TB 24.5, but you may need to first install this add-on:

https://addons.mozilla.org/en-US/thunderbird/addon/checkcompatibility/

The developer of MoreFunctionsForAddressBook can be contacted by clicking the Email icon at the top left of the add-on's webpage.

Hello Sfhowes, I just try the way you told me, installing checkcompatibility and then Contact Sidebar, but it doesn't work. I have the following message on the main TB page :

"XML Parsing Error: undefined entity Location: chrome :/ / contactssidebar / content / contactsPanel.xul Line Number 244, Column 9: "

Regards Birdee

What is your operating system and localization (language of TB)? I installed on Win 7 without any problems, as you can see in the pictures above.

Hello Sfhowes

I'm still on XP pack 3 and my operating system is in french as you can easily see with my broken English ! You're right, I need to change my operating system asap... Thanks for your precious help ! Regards Birdee