{"Status":true,"Message":"","Response":{"post":{"postuid":"6fvbc5wo16","tenantuid":"d8b744fc-2e70-4089-bb80-dd1d08f6c7b2","projectuid":"239698c5-f7eb-4574-8cc8-c6568f08b3a0","title":"Bounced Email Guide","slug":"article/6fvbc5wo16-bounced-email-guide","html":"\u003Cp\u003EWhen sending email, you will occasionally receive a notification in DailyStory that your message bounced.\u003C/p\u003E\u003Ch3 id=\u0022what_is_a_bounced_email\u0022\u003EWhat is a bounced email\u003C/h3\u003E\u003Cp\u003EA bounced email is a notification from the recipient\u0027s email system informing the sender that the message has not been delivered (or another delivery problem occurred). The original message is said to have \u0022bounced\u0022.\u003C/p\u003E\u003Ch4 id=\u0022what_causes_email_to_bounce\u0022\u003EWhat causes email to bounce\u003C/h4\u003E\u003Cp\u003EThere can be numerous causes that lead to an email server preventing delivery of your message:\u003C/p\u003E\u003Cul\u003E\u003Cli\u003EAn email filter prevented delivery of your message\u003C/li\u003E\u003Cli\u003EThe recipients inbox is full and is out of storage\u003C/li\u003E\u003Cli\u003EThe email address no longer exists\u003C/li\u003E\u003Cli\u003EThe amount of email sent to the domain it too high a volume in too short a time period\u003C/li\u003E\u003C/ul\u003E\u003Ch4 id=\u0022types_of_bounces\u0022\u003ETypes of bounces\u003C/h4\u003E\u003Cp\u003EThere are two distinct types of bounces that can occur.\u003C/p\u003E\u003Ccite class=\u0022recommended\u0022\u003E\u003Cspan class=\u0022title\u0022\u003ERecommended\u003C/span\u003E\u003Cp\u003EIf you receive a high bounce rate on an email send DailyStory will throttle delivery of additional messages.\u003C/p\u003E\u003C/cite\u003E\u003Ch5 id=\u0022soft_bounce\u0022\u003ESoft Bounce\u003C/h5\u003E\u003Cp\u003EA temporary issue related to the recipient\u0027s email server preventing delivery.\u003C/p\u003E\u003Cul\u003E\u003Cli\u003ECode usually starts with \u00224xx\u0022\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003ESoft bounces usually resolve themselves. DailyStory will continue checking the status of a soft bounced email for up to 12 hours.\u003C/p\u003E\u003Ch5 id=\u0022hard_bounce\u0022\u003EHard Bounce\u003C/h5\u003E\u003Cp\u003EA permanent issue related to the recipient\u0027s email server.\u003C/p\u003E\u003Cul\u003E\u003Cli\u003EMessage couldn\u0027t be delivered due to some sort of invalid, unchangeable, permanent reason\u003C/li\u003E\u003Cli\u003ESome are in your control and some are not (see below for tips for what is in your control)\u003C/li\u003E\u003Cli\u003ECode usually starts with \u00225xx\u0022\u003C/li\u003E\u003C/ul\u003E\u003Ccite class=\u0022recommended\u0022\u003E\u003Cspan class=\u0022title\u0022\u003ERecommended\u003C/span\u003E\u003Cp\u003ETo check your SPAM score (a numerical rating 0-10), you can use a free site like\u0026nbsp;\u003Ca href=\u0022https://www.mail-tester.com/\u0022\u003Ehttps://www.mail-tester.com/\u003C/a\u003E\u0026nbsp;to understand if your emails are at risk.\u003C/p\u003E\u003C/cite\u003E\u003Ch3 id=\u0022how_to_prevent_bounced_emails\u0022\u003EHow to prevent bounced emails\u003C/h3\u003E\u003Cp\u003EThere are several steps you can take to prevent emails from bouncing. And we recommend reading our detailed blog post for \u003Ca href=\u0022https://www.dailystory.com/blog/inbox-placement-9-tips-to-help-your-email-get-seen/\u0022\u003Eavoiding the junk folder and preventing bounced emails\u003C/a\u003E.\u003C/p\u003E\u003Ch3 id=\u0022use_clean_and_verified_data\u0022\u003EUse clean and verified data\u003C/h3\u003E\u003Cp\u003EIt\u0027s important that you keep your email lists clean and up-to-date.\u003C/p\u003E\u003Cul\u003E\u003Cli\u003ERefrain from using unreliable contact lists\u003C/li\u003E\u003Cli\u003ERemove incorrect or old emails which affect your bounce rate\u003C/li\u003E\u003Cli\u003EUse a service such as \u003Ca href=\u0022https://neverbounce.com\u0022 target=\u0022_blank\u0022\u003ENeverBounce\u003C/a\u003E to verify the deliverability of email addresses\u003C/li\u003E\u003C/ul\u003E\u003Ch3 id=\u0022avoid_common_content_spam_triggers\u0022\u003EAvoid common content SPAM triggers\u003C/h3\u003E\u003Cp\u003EThere are number of known SPAM triggers that you can avoid.\u003C/p\u003E\u003Cul\u003E\u003Cli\u003EAvoid numerous exclamation points. This can trigger mail providers to block your email as SPAM.\u003C/li\u003E\u003Cli\u003EUse standard fonts and colors. Unrecognized fonts and colors can trigger your email as SPAM.\u003C/li\u003E\u003Cli\u003ECompress images and use the rule of thumb of 70% text and 30% images.\u003C/li\u003E\u003Cli\u003ERemove excessive links. Emails will be flagged as SPAM if there are more than 6 links.\u003C/li\u003E\u003C/ul\u003E\u003Ch3 id=\u0022avoid_common_spam_words_and_phrases\u0022\u003EAvoid common SPAM words and phrases\u003C/h3\u003E\u003Cp\u003ESee our article \u003Ca href=\u0022https://www.dailystory.com/blog/keyword-blocklists-what-they-do-and-whether-you-should-use-them/\u0022\u003EKeyword blocklists: What they do and whether you should use them\u003C/a\u003E to access and download common SPAM keywords to avoid.\u003C/p\u003E\u003Ccite class=\u0022recommended\u0022\u003E\u003Cspan class=\u0022title\u0022\u003ERecommended\u003C/span\u003E\u003Cp\u003EAn acceptable bounce rate is between 2-5%. Anything over 5% suggests a problem you need to address and resolve. DailyStory report dashboards give you bounce % rates for individual emails and emails within a timeframe you can set.\u003C/p\u003E\u003C/cite\u003E\u003Ch3 id=\u0022bounce_code_descriptions\u0022\u003EBounce code descriptions\u003C/h3\u003E\u003Ctable border=\u00221\u0022 style=\u0022border-collapse: collapse; width: 100%;\u0022\u003E\u003Ctr\u003E\u003Ctd\u003ECode\u003C/td\u003E\u003Ctd\u003EDescription\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E421\u003C/td\u003E\u003Ctd\u003Eservice not available, closing transmission channel\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E450\u003C/td\u003E\u003Ctd\u003ERequested mail action not taken: mailbox unavailable (e.g., mailbox busy)\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E451\u003C/td\u003E\u003Ctd\u003ERequested action aborted: error in processing\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E452\u003C/td\u003E\u003Ctd\u003ERequested action not taken: insufficient system storage\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E500\u003C/td\u003E\u003Ctd\u003EThe server could not recognize the command due to a syntax error.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E501\u003C/td\u003E\u003Ctd\u003EA syntax error was encountered in command arguments.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E502\u003C/td\u003E\u003Ctd\u003EThis command is not implemented.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E503\u003C/td\u003E\u003Ctd\u003EThe server has encountered a bad sequence of commands.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E504\u003C/td\u003E\u003Ctd\u003EA command parameter is not implemented.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E550\u003C/td\u003E\u003Ctd\u003EUser\u2019s mailbox address is invalid\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E551\u003C/td\u003E\u003Ctd\u003EThe recipient is not local to the server.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E552\u003C/td\u003E\u003Ctd\u003EThe action was aborted due to exceeded storage allocation.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E553\u003C/td\u003E\u003Ctd\u003EThe command was aborted because the mailbox name is invalid.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E554\u003C/td\u003E\u003Ctd\u003EThe transaction failed for some unstated reason.\u003C/td\u003E\u003C/tr\u003E\u003Ctr\u003E\u003Ctd\u003E602\u003C/td\u003E\u003Ctd\u003EInternal error code that messages bounced after attempts over 8 hours.\u003C/td\u003E\u003C/tr\u003E\u003C/table\u003E\u003Ch3 id=\u0022bounce_and_retry_handling\u0022\u003EBounce and retry handling\u003C/h3\u003E\u003Cp\u003EDailyStory includes advanced logic for bounce/retry logic to automatically reset emails if a non-hard bounce error occurs.\u003C/p\u003E\u003Cp\u003EFor example, email recipients that return a bounce status due to:\u003C/p\u003E\u003Cul\u003E\u003Cli\u003EInbox full\u003C/li\u003E\u003Cli\u003EInbox over quota\u003C/li\u003E\u003Cli\u003EInbox temporarily disabled\u003C/li\u003E\u003C/ul\u003E\u003Cp\u003EIf a recipient is sent an email and a soft bounce is returned, the \u0027do not contact until\u0027 date is automatically set to a random date between four and seven days in the future. This is done to prevent sending multiple emails to an inbox that is not accepting them and potentially damaging the senders reputation.\u003C/p\u003E\u003Ccite class=\u0022recommended\u0022\u003E\u003Cspan class=\u0022title\u0022\u003ERecommended\u003C/span\u003E\u003Cp\u003EThese and other codes - at DailyStory\u0027s discretion - will instead change the contacts do not contact until a date to a future date between 15-30 days out. This ensures the contact can cool down for a period of time prior to being eligible for a future email campaign.\u003C/p\u003E\u003C/cite\u003E","publish_status":0,"post_type":"Article","authoruid":"74ef8477-e133-4a29-be36-bcf11ed681ac","author":{"authoruid":"74ef8477-e133-4a29-be36-bcf11ed681ac"},"featured_image_updating":false,"meta_description":"When sending email, you will occasionally receive a notification in DailyStory that your message bounced. What is a bounced email A bounced email is a notification from the recipient\u0026#39;s email system informing the sender that the message has not been delivered (or another delivery problem occurred). The original message is said to have \u0026#34;bounced\u0026#34;. What causes email to bounce There can be numerous causes that lead to an email server preventing delivery of your message: An email filte ...","display_toc":true,"has_workingcopy":false,"allow_indexing":true,"sort_order":10,"total_views":965,"date_published":"2024-10-15T17:06:00","date_updated":"2026-04-23T22:19:34.257","date_created":"2025-04-24T15:02:32.487"}}}