Change “From” name in MailChimp STS plugin [closed]

There are two modes email can be sent with the plugin:

  • simple emails are sent through STS;
  • email with anything that STS doesn’t support (custom headers, attachments, etc) are sent through fallback function, that is simply copy of native wp_mail() function.

For former plugin doesn’t set from name at all. For latter it default to WordPress and goes through those filters you found.

Since neither fits your description I think it is simply email client, that you are checking this with, is taking part of email to show as (missing) name.

So this is not something you currently do, because wp_mail_from_name filter is not used by plugin’s code. But it should be. I claim “it’s beta” defence and off to create ticket so this is corrected in next version. Sorry for inconvenience!