email campaigns

I used to be an email marketing Account manager for 4 years, as such I have immense knowledge strategy & experience in sending all types of email campaigns.

The problem i have is that I dont hold any official marketing qualifications and generally get overlooked for email marketing exec roles as a result. I end up being in roles that are part sales/part marketing.

In my current job I’ve brought in new email marketing ideas, and started the company off with email campaigns with immense success.
Because of this other departments now want a piece of the action. But rather than me doing the campaigns for them, they are handing all responsibility to marketing manager. Im not happy.

Will it be wrong thing to ask to be in charge of all email marketing in the company?

I was assigned to come up with a marketing campaign. Does this mean to come up with ideas, or actually make the newsletters, emails, etc.? Please help!! THANKS!!!