Cannot send emails with attachments greater than about 2MB over SSL/TLS or STARTTLS

Using free Version of poste.io mailserver, with letsencrypt certificates

Working: - Sending emails (roundcube and mailclient) with STARTTLS (587) or SSL/TLS (465) with attachments of About 2MB - Sending emails (mailclient) plaintext (25) with attachments greater than 16MB

Not Working: - Sending emails (roundcube and mailclient) with STARTTLS (587) or SSL/TLS (465) with attachments greater than 4MB

I olny found log Errors for haraka-submission: 2019-03-07 19:04:49.558611500 2019-03-07T19:04:49.558Z [ERROR] [0B4AD2F7-3366-4C35-B5EC-90F722AD5AAC.1] [core] Error 2019-03-07 19:04:49.558624500 at callback (/usr/lib/node_modules/Haraka/plugins.js:455:34) 2019-03-07 19:04:49.558626500 at /usr/lib/node_modules/Haraka/plugins/auth/auth_base.js:152:28 2019-03-07 19:04:49.558629500 at Connection.reset_transaction_respond (/usr/lib/node_modules/Haraka/connection.js:668:17) 2019-03-07 19:04:49.558631500 at callback (/usr/lib/node_modules/Haraka/plugins.js:483:35) 2019-03-07 19:04:49.558633500 at Object.callback (/opt/haraka-submission/plugins/log.js:54:22) 2019-03-07 19:04:49.558635500 at /usr/lib/node_modules/Haraka/node_modules/async/dist/async.js:2271:31 2019-03-07 19:04:49.558637500 at /usr/lib/node_modules/Haraka/node_modules/async/dist/async.js:969:16 2019-03-07 19:04:49.558639500 at /opt/haraka-submission/plugins/log.js:30:24 2019-03-07 19:04:49.558641500 at FSReqWrap.oncomplete (fs.js:135:15)

2019-03-07 19:05:19.587961500 2019-03-07T19:05:19.587Z [ERROR] [61FCD3B8-ED96-467B-9840-F07D1DE20B81.1] [core] Error 2019-03-07 19:05:19.587968500 at callback (/usr/lib/node_modules/Haraka/plugins.js:455:34) 2019-03-07 19:05:19.587969500 at /usr/lib/node_modules/Haraka/plugins/auth/auth_base.js:152:28 2019-03-07 19:05:19.587970500 at Connection.reset_transaction_respond (/usr/lib/node_modules/Haraka/connection.js:668:17) 2019-03-07 19:05:19.587972500 at callback (/usr/lib/node_modules/Haraka/plugins.js:483:35) 2019-03-07 19:05:19.587973500 at Object.callback (/opt/haraka-submission/plugins/log.js:54:22) 2019-03-07 19:05:19.587974500 at /usr/lib/node_modules/Haraka/node_modules/async/dist/async.js:2271:31 2019-03-07 19:05:19.587975500 at /usr/lib/node_modules/Haraka/node_modules/async/dist/async.js:969:16 2019-03-07 19:05:19.587976500 at /opt/haraka-submission/plugins/log.js:30:24 2019-03-07 19:05:19.587977500 at FSReqWrap.oncomplete (fs.js:135:15)

2019-03-07 19:31:18.377749500 2019-03-07T19:31:18.377Z [ERROR] [40C9A801-7CB6-4D46-A113-2F6926D674FB] [core] Error 2019-03-07 19:31:18.377766500 at callback (/usr/lib/node_modules/Haraka/plugins.js:455:34) 2019-03-07 19:31:18.377769500 at /usr/lib/node_modules/Haraka/plugins/auth/auth_base.js:152:28 2019-03-07 19:31:18.377771500 at Connection.reset_transaction (/usr/lib/node_modules/Haraka/connection.js:660:21) 2019-03-07 19:31:18.377775500 at /usr/lib/node_modules/Haraka/plugins/auth/auth_base.js:151:28 2019-03-07 19:31:18.377777500 at Connection.respond (/usr/lib/node_modules/Haraka/connection.js:594:19) 2019-03-07 19:31:18.377779500 at Timeout._onTimeout (/usr/lib/node_modules/Haraka/plugins/auth/auth_base.js:150:24) 2019-03-07 19:31:18.377781500 at ontimeout (timers.js:498:11) 2019-03-07 19:31:18.377783500 at tryOnTimeout (timers.js:323:5) 2019-03-07 19:31:18.377785500 at Timer.listOnTimeout (timers.js:290:5)

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