Force Mail From

English · Українська · Русский

The host emailed you that a letter from the site was blocked (“Invalid From”).
This free file fixes that for WordPress on Hosting Ukraine (adm.tools).

You do not need to be a programmer. Follow the three steps below.

1. Create a mailbox (if you do not have one yet)

In adm.tools: Mail → Mailboxes → Create.

Name it after the site, for example admin@mysite.com if the site is mysite.com.

Save the password. You do not have to read this mailbox every day. It exists so the host allows sending.

2. Tell the site to send from that mailbox

Hosting → My sites → your site → Settings.

Find Outgoing mail, choose admin@mysite.com, click Save.

If you skip this, the file will not help.

3. Upload the file

Download force-mail-from.php
(or the green button Code → Download ZIP, then take the .php file from the archive).

In adm.tools open File manager. Go to your site folder, then:

www → wp-content

If there is no folder mu-plugins — create it (New folder).
Open mu-plugins and upload force-mail-from.php there.

The path must look like this:

wp-content/mu-plugins/force-mail-from.php

Do not search for this file under Plugins in WordPress. It turns on by itself.

Several WordPress sites? Upload the same file the same way on each one.

If your mailbox is not admin@

Only then open the file in Notepad. Find:

define( 'FORCE_MAIL_USER', 'admin' );

If the mailbox is info@mysite.com, change admin to info.
If it is already admin@... — change nothing.

Not WordPress? Do not upload this file

This file works only on WordPress. It does nothing on OpenCart, Joomla, Prestashop, or a custom PHP site.

For those, do two things in the panel and in the CMS — the same existing mailbox in both places, not Gmail:

1. adm.tools: My sites → the site → Settings → Outgoing mail → choose e.g. info@mysite.com → Save.
2. In the CMS set the store / site email (the From address) to that same mailbox.

OpenCart: System → Settings → General (not the Mail tab) → field E-Mail.
The Mail tab only chooses Mail vs SMTP. Put Gmail in a mailbox forward, not in From.

Did it work?

Send a test from the site (a form or “forgot password”).
The sender should be your site mailbox, not Gmail.
The next day the host should not email you about a blocked From.

Support / Donate

Monobank jar

License

MIT.