HIgh Rate of Intermittent "Failed to send …" Errors

  • (Takayuki?) We set up a Contact Form 7 form on 7/10 and have gotten about 25 responses. Unfortunately we have also gotten 3 or 4 (emailed) complaints of “Failed to send…” errors. (Our “From:” field under the Mail tab is set to an email address from our domain.)

    I have read carefully through your website FAQ on this, indicating that these errors come from either the message being flagged as Spam or due to actual mail server trouble. Our Barracuda logs do not show any of the complaint email addresses showing up as Spam, and my client is having trouble with the explanation that these are due to mail server failures.

    Just to help out us webmasters in the trenches… what are some of the failures that could trigger the “Failed to send…” message attributed to mail server failures? Could a DNS failure trigger this message? A temporary interruption in internet services? How do you determine when to show this message?

    https://www.ads-software.com/plugins/contact-form-7/

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  • Thread Starter FeralReason

    (@feralreason)

    Or — what file in the plugin receives errors from the mail server and decides which CF7 messages to send to the user? If I have this maybe I can figure out the answer to my question on my own. Thx!

    Thread Starter FeralReason

    (@feralreason)

    @buzztone – thanks. I’m looking at it.

    On Contact Form DB – I agree completely. Have proposed this to my Client but gotten no response. However – since it appears that Contact Form DB would capture the http POST msg before it gets processed by CF7’s form handler, it would seem to solve two problems. 1)The values are captured even if the user gets an error 2) It provides some debugging help to see why the error occurred. e.g. when the submission is blocked for blacklist reasons (see below.)

    In digging into the CF7 code, I found out that, in testing for spam, (besides verifying Nonce values and checking to see if the User Agent string is longer than 2 characters) CF7 checks the WordPress blacklist. So if I previously maintained that blacklist strictly to fight Comment Spam, there may be words and phrases that should be removed from the blacklist to prevent CF7 form submissions from being blocked.

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