Unable to connect SMTP server:smtpout.mail.zoho.com Reason:Authentication failed:554 5.1.8 Sender Address Blocked could you please help. Thanks

hello. my mail account .

even after i update to paying account, still not working.

Unable to connect SMTP server:smtpout.mail.zoho.com Reason:Authentication failed:554 5.1.8 Sender Address Blocked

could you please help.

I have post this for 2 days, and i wrote 3 different mails to support@zohomail.com

but haven't got any feedback.

as a fashion accessory company i need to send our new lookbook to all of out clients.

I dont think it is abuse of over using zoho mail.

i have wrote these to support@zohomail.com ,how long this process will take?

please understand this is an emergency situation.

and i have to pay another account to make my business keep on working .

Thanks

best regards.

Wenbino