Emails sending failed to gmail

SMTP Servers
#1

Why postal SMTP mail server unable to send email to GMAIL IDs? I have tried multiple times but the email was not being delivered to gmail. How can this issue be solved? or Postal SMTP server is blocked for sending email to gmail addresses?

Looking forward to hearing from you.

Thanks

#2

you are not able to send mails too gmail id, there could be many reason few may be

  1. gmail blacklist your server
  2. smap content detected