laravel swift-mailer exception "Expected response code 250 but got an empty response" using gmail smtp-relay (database queue driver)

user_10543844 0
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the gmail smtp-relay works fine using the sync driver, but if we queue the email we this error. cleared config, cache, & restarted queue workers. tested in prod and dev, same results

[2021-01-24 20:04:22] production.ERROR: Expected response code 250 but got an empty response {"exception":"[object] (Swift_TransportException(code: 0): Expected response code 250 but got an empty response at /home/****/****/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:448)

were wondering is this because of serialization and something is not making it through that process??? using latest stable release of laravel >8.0. gmail smtp is authenticating just fine, per why the sync driver sends emails easily. maybe there needs to be a timeout on the queue jobs so they dont barrage gmail so quickly? also our code works fine using sendgrid for example as the smtp relay. thanks.

laravel swiftmailer smtp gmail queue
2 Answers
user_40904670

For users of smtp-relay.gmail.com, if you use localhost/127.0.0.1 as domain during developments, you probably need to change the domain name to use in EHLO command to begin the transaction. I solved this by adding &local_domain=dev.mydomain.tld at the and of my DSN.

smtp://smtp-relay.gmail.com:587?encryption=tls&local_domain=dev.mydomain.tld&...

For SwiftMailer Symfony bundle (since 2.4.0), you can set the local_domain config parameter:

// config/packages/dev/swiftmailer.yaml
swiftmailer:
    ...
    local_domain: dev.mydomain.tld
user_27933180
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