Avoid mail forwarding, configure pop3 or imap on destination instead. In gmail that should be "Check mail from other accounts" section. You should avoid forward

Avoid mail forwarding, configure pop3 or imap on destination instead. In gmail that should be "Check mail from other accounts" section. You should avoid forwarding, because mail from domains with SPF gets discarded, if SRS isn't enabled by middleman. Additionally, gmail incoming spam/rate filters can disrupt your correspondence.