![]() If possible you can contact the owner of the particular mail id to allow you into the valid sender whitelist, so that your emails won't get rejected.Įrror code 550 5.7.1 - Blocked, Marked as spam, Authentication.You should immediately remove this user from your campaign list since they clearly don't want anyone else emailing them but a few exceptions.The only way this could be resolved is if somehow the email id admin adds your IP to the allowed list.This is a critical security protocol that Gmail expects the email sending server to perform for all of the emails sent. This means that the email you are receiving is encrypted and cannot be read by anyone in the process of transmission. The text besides that lock should say a TLS encryption. You might have seen a lock symbol at the left corner of your email. TLS required for RCPT domain, closing connection. In case you still want to send an email to the user, you might want to get in contact with the user for the whitelisting of your email. What you can do is currently stop sending emails to the user.This states that you are sending emails to an email id of which the user has created a whitelist, Which means that it will only allow emails from the domain that are explicitly mentioned by the owner of that particular email id.IP not in whitelist for RCPT domain, closing connection. This will make it easier for you to send emails and increase volume. Contact your Mail service providers, they will help you with this process called email warmup.You need to increase your email volume slowly if you are sending emails through a new domain. This is a sure way of getting marked as spam mail. In case you have a relatively new email sending domain that is less than a year old, then it is not wise to send millions of emails on the first go.You can take the assistance of the email tester for that. After a successful resolution of email issues, you can go for delisting of the domain/IP from the respective blocklist.If in case it is in the blocklist, you will need to fix the issues with the email in the first place. ![]() Get your domain and IP checked if it is in an email blocklist.Your domain is being blocked because of being identified as spam or due to a drastic increase in email sending rates. To protect our users from spam, mail sent from your IP address has been temporarily blocked. Here are some of these tutorials that can help with the setup:Ĥ21-4.7.0 Our system has detected an unusual rate of unsolicited mail originating from your IP address.You can use checker tools to identify the issues and generate records.Gmail has a strict policy for these and does that to prevent the Gmail users from any kind of malicious activities. You may have issues with your SPF, DKIM, and DMARC alignment which is a part of Gmail's email authentication, you can check our detailed tutorials for that. To best protect our users from spam, the message has been blocked. Error code 550 5.2.2 - SPF policy alignment failedĮrror code 421 4.7.0 - Not in the whitelist, Authentication issue, Spam 421-4.7.0 This message does not have authentication information or fails to pass authentication checks.Error code 550 5.7.26 - SPF DKIM policy alignment failed.Error code 550 5.7.26 - DMARC policy failed.Error code 550 5.2.1 - Email sending limit reached.Error code 550 5.7.1 - Blocked, Marked as spam, Authentication.Error code 421 4.7.0 - Not in the whitelist, Authentication issue, Spam.This will help you to immediately act on the situations that may arise due to something going really wrong with your emails or your email sending domain. In this blog, we are focusing on the response codes that are related to spam emails. Usually, it takes a while for us to understand that these issues have occurred, and until then some damage is done either to the campaign result or the domain reputation which can be noticed earlier by fetching SMTP response codes. Often times we have delivery issues like rejected and dropped emails, and emails landing in spam.
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