zimbra Email

Job ID: 34387535

Budget: $30 – $250 USD

Need to solve below :
1) When my customer read the email from Microsoft Outlook [POP], the zimbra webmail still show the email is unread. Need to solve this issue?
2) host gmail-smtp-in.l.google.com[64.233.167.27] said:
550-5.7.1 [75.119.150.121 12] Our system has detected that this
message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam
sent to Gmail, 550-5.7.1 this message has been blocked. Please visit
550-5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 550
5.7.1 for more information.
y13-20020a056000168d00b00222d108e8d5si6028704wrd.542 - gsmtp (in reply to
end of DATA command)

Thank you