When sending invitations from my contacts or recent addresses drop-down list, with outgoing mail server smtp.gmail.com, I get the following error : " Message sending failed since the following recipients were rejected by the server".

Reproducible: Always

Steps to Reproduce:
1. I send an invitation to someone from the drop-down list (from my contact list) with the format  "ContactName <Contact.Name@domain.xxx>".


Actual Results:  
I always get the following error : "E-Mail Sending Failed - Failed to transport message.  Message sending failed since the following recipients were rejected by the server: ContactName (The server responded: "5.5.2 Syntax error g78sm112724itb.12 - gsmtp")

Expected Results:  
To receive a notification displaying that the e-mail has been sent successfully. 

1. My outgoing mail server is "smtp.gmail.com".  
2. I tried with the outgoing mail server "smtp-mail.outlook.com" and it works as expected.  
3. It is a google-smtp-related problem.
4. An easy, but not user-friendly, workaround is to remove the "ContactName<" and ">" part of the drop-down list contact.  The drop-down list is useful to get contacts and recent e-mail addresses, but with this bug, it becomes less useful.