{"id":708,"date":"2024-08-29T16:10:57","date_gmt":"2024-08-29T14:10:57","guid":{"rendered":"https:\/\/mailnjoy.com\/blog\/?post_type=glossary&p=708"},"modified":"2024-11-29T11:08:13","modified_gmt":"2024-11-29T10:08:13","slug":"soft-bounce","status":"publish","type":"glossary","link":"https:\/\/mailnjoy.com\/blog\/en\/glossary\/soft-bounce\/","title":{"rendered":"Soft bounce"},"content":{"rendered":"

A soft bounce<\/strong> is an email marketing concept.<\/span><\/p>\n

It refers to a notification which indicates that a message sent has not been received successfully. In contrast to a hard bounce, a soft bounce is a temporary notification of failure<\/strong>, which indicates that the address concerned was unable to receive the email sent at the time of sending, but also that the receiving address does exist<\/strong>.<\/span><\/p>\n

 <\/p>\n

There are several possible causes of a soft bounce, the main ones being :<\/span><\/p>\n

 <\/p>\n

– a recipient SMTP server that was down or malfunctioning<\/strong> when the email was sent<\/span>
\n– an overloaded recipient SMTP server<\/strong> when the email is sent<\/span>
\n– the recipient’s mailbox is full<\/strong> and cannot receive any other emails<\/span>
\n– a temporary blockage of the email sent because the sender IP or domain is considered suspicious<\/strong><\/span>
\n– a temporary blockage of an email sent because too many emails have been sent to the same domain too quickly<\/strong><\/span>
\n– a temporary blockage of an email sent based on suspected spam content<\/strong>.<\/span><\/p>\n

 <\/p>\n

Whatever the reason for the blockage, the soft bounce notification indicates that the content of the email could not be delivered to the recipient<\/strong>, and that the sending server has stopped trying to deliver it (i.e. the message has not been received and will not be, unless you ask for it to be sent again).<\/span><\/p>\n

 <\/p>\n

Like hard bounce, a soft bounce is generally sent to the email address from which the message originates (header \u201cFROM:\u201d field), by the SMTP server which was supposed to receive the email (header \u201cTO:\u201d field).<\/span><\/p>\n

 <\/p>\n

Given the multiple possible causes that can generate this type of bounce, different return codes will be used by SMTP servers to indicate that this is a soft bounce, mainly in the \u201c45x\u201d code range (e.g. the message \u201c450 mailbox overquota\u201d for a full mailbox).<\/span><\/p>\n

 <\/p>\n

As with hard bounces, email routers monitor their customers’ average soft bounce rates, to detect possible deliverability problems on sending domains or IPs. An excessively high soft bounce rate is therefore an important metric that often indicates a degraded reputation of the sender domain<\/strong>, and is associated with recurring problems in sending emails.<\/span><\/p>\n

 <\/p>\n

Unlike hard bounces, soft bounces are created within a specific configuration (which was used when sending the message), and therefore do not indicate an invalid mailbox. They therefore indicate a problem in the delivery of that specific email, and not an invalid recipient mailbox status<\/strong>.<\/span>
\nSo they will not necessarily be detected by an email checker, which primarily detect invalid emails (hard bounce). It should be noted, however, that certain types of soft bounce can be detected by good quality mail testers (e.g. emails with a mailbox full).<\/span><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

A soft bounce is an email marketing concept. It refers to a notification which indicates that a message sent has not been received successfully. In contrast to a hard bounce, a soft bounce is a temporary notification of failure, which indicates that the address concerned was unable to receive the email sent at the time […]<\/p>\n","protected":false},"author":3,"featured_media":0,"parent":0,"template":"","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","footnotes":""},"glossary-cat":[],"class_list":["post-708","glossary","type-glossary","status-publish","hentry"],"yoast_head":"\nSoft bounce : definition and uses<\/title>\n<meta name=\"description\" content=\"What is a soft bounce in email marketing. 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