Support » Plugin: Postman SMTP Mailer/Email Log » Gmail API, Assertion failed and Cannot modify header information

  • Resolved Cemtey


    Warning: assert(): Assertion failed in …/www/wp-content/plugins/postman-smtp/Postman/Postman-Mail/PostmanZendMailTransportConfigurationFactory.php on line 63

    Warning: Cannot modify header information – headers already sent by (output started at …/www/wp-content/plugins/postman-smtp/Postman/Postman-Mail/PostmanZendMailTransportConfigurationFactory.php:63) in …/www/wp-includes/pluggable.php on line 1196

    Worked previously, changed provider. Emails are sent out but error shows on screen. Using Gmail API.

Viewing 4 replies - 1 through 4 (of 4 total)
  • Plugin Author Jason Hendriks


    Would you please look in Manually Configure > Message

    Is your email shown in Envelope From Address? This was supposed to be automatically set during plugin activation.

    Fixed by deleting Postman plugin and reinstalling. Under advanced it did not recognize /tmp either at that point when it was broken. Might have been issue with extension removal, where I chose to erease files aswell. Therefore perhaps it ereased postman files to work as API extension. If so, create update that would cover these files incase others did the same. Error wasn’t visible before testing through site.

    Edit: As answer to question, it was not shown under envelope address at that point. After deletion and installing again it appeared there on it’s own.

    Plugin Author Jason Hendriks


    It sounds like the Activation Handler did not run for some reason :-/

    No Postman Gmail Extension lives in a separate folder and erasing it wouldn’t have caused this.

    Activate/Deactivate probably would have fixed it as well. Too late to tell now.

    Are you on a multisite?

    Plugin Author Jason Hendriks


    I found this just now : From Function Reference/register activation hook

    “This hook is now fired only when the user activates the plugin and not when an automatic plugin update occurs”

    Well who knew. Postman is five months old and has been doing this wrong since the start.

    This explains so much. :p

Viewing 4 replies - 1 through 4 (of 4 total)
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