gmailurl
I know that I can quickly launch New message dialog by going to https://mail.google.com/mail/u/0/#inbox?compose=new. I often send a file to a list of my colleagues so it would be nice to have the To: field prefilled with their emails.
Is it possible to go further and fill in the To: field with a list of addresses?
I do this also, and it works fine for me, but all of my email addresses are @mydomain.com. You may have to use one of the emails in the account @mydomain.com as your base rather than your @gmail.com.
That also might be better if you have less of an issue if your @mydomain.com remains in the header when you use @gmail.com as your sender.
Not sure it's the perfect solution, but maybe better than your current one.
You can show from address in GMail's compose view by switching to the old Gmail interface using the browser extension Retro Compose (Chrome), Old Compose (Chrome+Firefox), or Fix Compose for Gmail:
Best Answer
Pulled this from Stack Overflow... this URL seems to do the trick
We're integrating with Slack and have a bot letting us know when new emails to our Google Groups come in. I was looking for this same thing to add a hyperlink to the Slack notification that allows us to quickly reply to the sender via Gmail (instead of mailto trying to use Outlook or another default mail client).
Haven't found a way to pre-fill the "To" field in the nice Gmail pop-up composer though... only through this full screen option.
Stack overflow source