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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 14.0.3
Operating system and version (eg, Ubuntu 17.04): Ubuntu 18.04 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache
PHP version (eg, 7.1): 7.2
The issue you are facing:
Mail is not showing body of email. If the email is plain text i can see it. Seems to be after i enable a self signed SSL certificate.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
Level App Message Time
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:15:37+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:15:34+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:15:08+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:15:00+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:13:52+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:13:14+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:10:21+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:10:19+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:10:00+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:09:58+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:09:58+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:09:56+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:09:35+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T15:09:15+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T14:21:05+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T14:21:01+0000
Error mail Creating account failed: Server denied authentication. 2018-10-29T14:18:22+0000
Error mail Creating account failed: Server denied authentication. 2018-10-29T14:18:05+0000
Error index TypeError: Argument 7 passed to OCA\Mail\Controller\PageController::__construct() must be of the type string, null given 2018-10-29T14:17:55+0000
Error index TypeError: Argument 7 passed to OCA\Mail\Controller\PageController::__construct() must be of the type string, null given 2018-10-29T14:16:30+0000
Error mail Creating account failed: Server denied authentication. 2018-10-29T14:16:19+0000
Error mail Creating account failed: Server denied authentication. 2018-10-29T14:15:59+0000
Error mail Creating account failed: Server does not support TLS connections. 2018-10-29T14:04:54+0000
Error mail Creating account failed: Server denied authentication. 2018-10-29T14:04:42+0000
Error mail Creating account failed: Server denied authentication. 2018-10-29T14:04:39+0000
Error mail Creating account failed: Server denied authentication. 2018-10-29T14:04:20+0000
Error mail Creating account failed: Error connecting to SMTP server. 2018-10-29T14:04:05+0000
Error index TypeError: Argument 3 passed to OCA\Mail\Controller\FoldersController::sync() must be of the type string, null given, called in /var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php on line 166 2018-10-29T14:03:06+0000
Error index TypeError: Argument 3 passed to OCA\Mail\Controller\FoldersController::sync() must be of the type string, null given, called in /var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php on line 166 2018-10-29T14:02:36+0000
Error index TypeError: Argument 3 passed to OCA\Mail\Controller\FoldersController::sync() must be of the type string, null given, called in /var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php on line 166 2018-10-29T14:02:15+0000
Error mail Updating account failed: Server denied authentication. 2018-10-29T14:00:31+0000
Error mail Updating account failed: Server denied authentication. 2018-10-29T14:00:18+0000
Error mail Updating account failed: Server denied authentication. 2018-10-29T13:59:48+0000
Error mail Updating account failed: Server denied authentication. 2018-10-29T13:59:34+0000
Error mail Updating account failed: No password provided. 2018-10-29T13:59:00+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T13:56:31+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T13:55:02+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T13:54:57+0000
Error PHP Undefined index: externalConnectable at /var/www/html/nextcloud/apps/ojsxc/templates/settings/personal.php#36 2018-10-29T13:54:47+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:50:48+0000
Error index TypeError: Argument 7 passed to OCA\Mail\Controller\PageController::__construct() must be of the type string, null given 2018-10-29T13:49:19+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:48:05+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:48:05+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:48:04+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:48:04+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:48:04+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:48:04+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:48:04+0000
Error index TypeError: Argument 2 passed to OCA\Mail\Http\AttachmentDownloadResponse::__construct() must be of the type string, null given, called in /var/www/html/nextcloud/apps/mail/lib/Controller/MessagesController.php on line 266 2018-10-29T13:48:04+0000
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oc7uzn5dps2c',
'passwordsalt' => '-----------',
'secret' => '----------------------',
'trusted_domains' =>
array (
0 => 'LOCALIP',
1 => 'EXTERNAL IP',
),
'datadirectory' => '/media/data/data',
'dbtype' => 'mysql',
'version' => '14.0.3.0',
'overwrite.cli.url' => 'https://IP-ADDRESS',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextclouduser',
'dbpassword' => '------------',
'installed' => true,
'mail_from_address' => 'tech',
'mail_smtpmode' => 'smtp',
'mail_domain' => '-------------------',
'mail_smtphost' => '------------------------',
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE