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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?

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Sending email is done using SMTP, not IMAP or HTTP. –  grawity Feb 17 '11 at 21:52
yes i set max connection just in case if it reaches max connection limit and server deny sending email. –  Maximus Feb 17 '11 at 22:02

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