Email notifications are not arriving
There are many reasons why this might happen, and it may be difficult to narrow down the cause.
It could – for example – be that your ISP or server is being too sensitive with the spam filter. Invoice Rocket notifications are sent in HTML format but don’t contain anything out of the ordinary so for 99% of people there should not be any problems.
Here’s some things you could try
1) Disable all 3rd party plugins and see if notifications start working. If they do, then one of the plugins must have been conflicting with Invoice Rocket.
2) Install a email logging plugin like Email Log (there are others). It logs every email notification sent through WordPress. If you see emails getting logged but you don’t receive any emails, then you know Invoice Rocket is sending emails but something else is either stopping them from sending or stopping them from arriving.
3) You could use a free transactional email service such as Sendgrid with the official WP plugin. This will route all WordPress email notifications through the transactional service while completely bypassing the standard wp_mail() function. Mailgun is another service you might prefer. Many of these services have free tiers.
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