I am using paid version of Postbox and thunderbird both have problem in sending emails. Sending mail progress keeps loading. I have around 50+ IMAP email addresses sometimes mail send successfully and sometimes it stuck. Initially I thought it is my mail server problem but later when I used softwares thebat and em Client I found its a thunderbird and postbox problem and I believe they both are from same vendor.
I have set max imap connections 5 and http connections 5.
Can any one guide me how do I solve this problem?
