We’ve been having Varnish cache issues when emailing event attendees for the past few events over the past month or so. Searching the forums i did not find much info, so i first contacted my Host (Dreamhost). They responded saying that it appears to be a compaitibility issue between Event Espresso and Varnish Cache. See the message below that i sent with their response below:
> Good day support,
>
> We’ve been having an issue when sending out emails with the Event Espresso
> plugin.
>
> When eveer we send out a bulk email message of more than 20-30 emails we get
> the following error message:
>
> “Error 503 Service Unavailable
>
> Service Unavailable
>
> Guru Meditation:
>
> XID: 1046952116
>
> Varnish cache server”
>
> I’ve checked the Event Espresso site and this is not a common issue on their
> side. From my quick research it appears to be something that i’m hoping you
> can assist with.
>
> Please advise
>
>>Hey Jaco!
>>It seems like there be an issue with compatibility. You will want to
>>contact the plugin developer for Event Espresso to see if they know of
>>any compatibility issues with Varnish. We tried looking on their site but
>>it wasn’t loading.
>>If they can give you some information regarding why it’s not working,
>>that could be helpful.
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