daily email report failing

I’m trying to setup a daily report email to be used as a check that the PC and WD are running. I’ve entered all the info for sending an email but the test email is never received. Looking at ftplogfull.txt I see that I get connected, the full report and then SMTP protocol error at the end. Not sure where to go from there.

`warning email send*

Connecting to mail server.
OK
Connected.
+OK Dovecot ready.


CURRENT WEATHER REPORT FROM: Anthem N Parkside
Conditions: Dry
Temperature: 105.9 ц(41.1 у )
Trend: -0.5 ц /hr
Average windspeed: 5.8 kts
Current speed: 7.0 kts
Direction: SSW 197 Ѝ
Barometer: 29.752 in. (1007.5 hPa )
Pressure trend -0.001in./hr
Humidity: 26 %
Dew point: 63.9 ц
Todays rain: 0.03 in.
Monthly rain: 0.61 in.
Yearly rain: 2.50 in.
Maximum temperature: 107.1 ц (41.7 у) at time: 4:45 PM
Maximum heat index temperature: 112.3 ц at time: 3:14 PM
Minimum temperature: 76.3 ц (24.6 у) at time: 7:42 PM
Maximum gust today: 27.0 kts NE at time: 7:18 PM
Max gust last 10 mins: 9kts
Current Heatindex: 110.0 ц
Solar radiation: 0.0 w/m2
Sunshine hours for year: 0.0
Sunshine hours for month: 0.0
Sunshine hours for day: 0.0
Created by “Weather Display” version 10.37S Build 73 3:58:56 PM 7/30/2018
Time of Weather report: 5:34:35 PM Date of report: 7/30/2018
Sending email to server 173.214.186.181
161: SMTP protocol error. +OK Dovecot ready…
`

what sort of email server is it?
i.e does it use authentication?

After trying all combinations of the security options I got it to work with auth, SSL and explicit SSL all checked.

Thanks for the quick reply.