https:// not being added to linked attachments when email form is sent

Hi Yehuda,

I use Gravity Forms in WordPress to collect trip reports via a form in our intranet. I use Post SMTP and SendGrid to handle the mail. Colleagues fill out the form and then attach their report file to the form. Several people are then alerted by email that a report has been posted. A link to download the report is in the alert email.

Recently, I have noticed that sometimes, https:// is not being added to the link in the attached report file — and then people who receive the email alert can’t open the file. Instead, they are brought back to the login page of the intranet site. This does not occur with every instance; only sometimes.

Also, the form entries go into a Gravity View table on the intranet site. There, all the links are whole and do work properly.

So I think the problem is happening during the sending process somehow.

Any idea of how I can resolve this, or point me in the right direction? My Post SMTP details are below, and examples of what the links look like:

Without https://
https://avrdc.org/wp-content/uploads/2018/08/without-https.jpg

With https://
https://avrdc.org/wp-content/uploads/2018/08/with-https.jpg

Post SMTP details

HostName: avr.avrdc.org
OS: Linux avr.avrdc.org 2.6.32-042stab128.2 #1 SMP Thu Mar 22 10:58:36 MSK 2018 x86_64
PHP: Linux 7.0.30 C
PHP Dependencies: iconv=Yes, spl_autoload=Yes, openssl=Yes, sockets=Yes, allow_url_fopen=Yes, mcrypt=Yes, zlib_encode=Yes
WordPress: 4.9.8 en_US UTF-8
WordPress Theme: Arras
WordPress Plugins: Gravity Perks, Gravity Forms, Category Posts Widget, Connections Business Directory, WP E-Signature Business add-ons, WP E-Signature, Easy Theme and Plugin Upgrades, ECWD Custom Fields, ECWD Frontend Event Management, ECWD Import/Export, Event Calendar WD Premium, GP Unique ID, Gravity Forms Upload Rules, Gravity Forms Signature Add-on by ApproveMe, GravityView – Gravity Forms Import Entries, GravityView, Inline Google Spreadsheet Viewer, Members Only, Members, Page and Post Lister, Post SMTP, Quiz Cat Business, Rotating Tweets (Twitter widget & shortcode), WD manager, WP Fastest Cache, WP-Filebase Pro, WP Users Exporter
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email
Postman: 1.9.4
Postman Sender Domain (Envelope|Message): worldveg.org | worldveg.org
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: SendGrid API (https://api.sendgrid.com:443)
Postman Active Transport Status (Ready|Connected): Yes | Yes
Postman Deliveries (Success|Fail): 4781 | 14
Postman TCP Timeout (Connection|Read): 20 | 60

Thanks!