JulesWebb on "[Plugin: Postman SMTP Mailer/Email Log] Problems sending emails. No outbound route port 25, 587"

Hello

I'm having trouble sending emails. Below is the error I get when I try sending a test email.

Communication Error [334] - make sure the Envelope From email is the same account used to create the Client ID.

Below are the results of my Diagnostic Test

OS: Linux serv01.m43.siteground.biz 2.6.32.59-sg3 #9 SMP Wed Sep 26 03:29:25 CDT 2012 x86_64
HTTP User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36
Platform: PHP Linux 5.5.25 / WordPress  4.2.2 en_US
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=Yes
WordPress Theme: Layers Child
WordPress Plugins: Gravity Forms, Aesop Story Engine, All In One SEO Pack, Auto Terms of Service and Privacy Policy, Bloom, Gravity Forms Constant Contact Add-On, Gravity Forms Terms of Service Field, Gravity Forms Logging Add-On, Gravity Forms Signature Add-On, iThemes Security Pro, iThemes Sync, Layers - Updater, Menu Social Icons, User Profile Picture, Monarch Plugin, Postman SMTP, Redirection, SB-RSS_feed-plus, SG CachePress, Shortcodes Ultimate, Simple Image Sizes, Special Recent Posts PRO Edition, TinyMCE Advanced, Testimonials Wordpress plugin, UpdraftPlus - Backup/Restore, WP-DBManager, WP Rocket, WP Smush Pro, WPMU DEV Dashboard, WPMU DEV Videos
Postman Version: 1.6.23
Postman Sender Domain (Envelope|Message): dc-acupuncture.com|dc-acupuncture.com
Postman Prevent Message Sender Override (Email|Name): No|No
Postman Transport URI: smtp:ssl:oauth2://smtp.gmail.com:465
Postman Transport Status (Configured|Ready|Connected): Yes|Yes|Yes
Postman Deliveries (Success|Fail): 0|2
Postman Bind (Success|Fail|Path): Yes|No|/home/dcacupun/public_html/wp-content/plugins/postman-smtp/Postman/PostmanWpMailBinder.php
Postman TCP Timeout (Connection|Read): 10|60
Postman Email Log (Enabled|Limit|Transcript Size): Yes|10|128
Postman Run Mode: production
Postman PHP LogLevel: 40000
Postman Stealth Mode: No
Postman File Locking (Enabled|Temp Dir): Yes|/tmp

Screenshot of Connectivity Test
http://webbdemo.com/images/p1.png

I think the problem resides with either settings from iThemes Security Pro or the hosting provider Siteground. I was wondering if you know of issues with either.

Appreciate any insights or feedback!
jules

https://wordpress.org/plugins/postman-smtp/