Check the sending domain for DNS errors

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If you continue to ignore bounce emails, the reputation of the sender's IP address may decline. IP address reputation is a mechanism for restricting communication when sending emails by evaluating the reputation of the IP address from which the email is sent. A decline in reputation leads to a decline in trust from email providers, which may impair future email deliverability.




What is IP reputation? How to improve email deliverability!
Some companies who distribute email newsletters mail marketing to doctors may have felt that their delivery rate is low. There are various reasons for low delivery rates, such as email capacity and domain, but one of them is low IP reputation. In this article, we will introduce how to improve IP reputation and increase delivery rate.
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It will be blacklisted and marked as spam.
It is possible that your email provider may blacklist your email as spam and block your emails. It takes a long time to unblock an IP address once it has been blocked. Take appropriate measures to deal with bounced emails, and make sure that legitimate emails are not treated as spam.




Are you blacklisted and can't receive emails? What causes this and how to check?
When sending emails, the recipient may consider it to be spam and add it to their blacklist. In this article, we will introduce how to check if your email address is on a blacklist and what you can do to avoid being added to a blacklist.
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How to deal with bounced emails
Here are some countermeasures you can take if the above-mentioned reasons result in a bounced email.



How to deal with soft bounces
Let’s start by looking at how to deal with soft bounces.



Check the capacity of the recipient's mailbox
If the recipient's mailbox is full and cannot receive new emails, you will receive the following error message:

message size exceeds remaining quote

Sorry, my mailbox is full.

full mailbox

Since this problem is caused on the receiving side, you should ask them to delete unnecessary emails to free up space, or to increase the email receiving capacity in the first place. It is also important to encourage them to make sure they can receive emails on a regular basis.



Check the email size
If the size of the email you sent is too large, you will receive an error message like this:

message is too large

message file too big

message exceeds maximum fixed size

Since email capacity differs depending on the destination server, it is difficult to deliver to all destinations. Basically, when creating an email, it is important to keep in mind that the email capacity should be as light as possible.

It may also be that the file size attached to the email is too large.
When attaching a file, there are three main ways to deal with this:

1. Compress into a zip file
2. Split the file
3. Upload to storage and enter the download URL

There are various methods other than the above. There are various ways to distribute, such as email newsletters and business communications, so please use the method that suits your distribution!