A soft bounce is a temporary email delivery failure, such as a full inbox, a receiving server that is down or busy, or a message that is too large. Unlike a hard bounce, the address may still be valid, and the message may go through on a later try.
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In one line
A temporary delivery failure, such as a full inbox or a server that is down. The message may go through on a later try.
Receiving servers report bounces with codes. Temporary failures generally use codes starting with 4, while permanent failures start with 5. Most email platforms automatically retry soft bounces for a period, then give up. Common causes include mailbox full, server unavailable, rate limiting when you send too much too fast, and temporary blocks while a provider evaluates your sending reputation.
One soft bounce is normal. Repeated soft bounces to the same address can signal an abandoned mailbox, and many platforms convert an address to suppressed after several failures in a row. A sudden rise in soft bounces across many recipients often points to throttling or reputation problems rather than issues with individual addresses, so check your domain and sending volume first.
Why it matters to recruiters
Recruiters need to know whether a message reached a candidate or client. Understanding soft bounces helps you decide when to retry, when to find another contact method and when to look for a bigger deliverability problem. Treating every soft bounce as a dead address loses good contacts, while ignoring repeated bounces can hurt your sender reputation.
An example from a recruiting desk
Of 15 interview invites a recruiter sends, two soft bounce with a mailbox full message. The platform retries over the next day, and one goes through. For the other, she texts the candidate, with consent on file, to ask for another email. The next week many unrelated contacts soft bounce at once, so she checks her domain reputation.
Tips that help
Let your platform retry soft bounces before you act.
Suppress addresses that soft bounce several times in a row.
Use another channel, such as a phone call, for important messages that bounce.
Investigate a sudden spike in soft bounces as a possible reputation issue.
Mistakes to avoid
Deleting good contacts after a single temporary failure.
Ignoring a pattern of soft bounces that signals throttling or blocking.
Which tools help?
A few of the email verification tools in our directory, including our picks. Prices are the published starting price on the date we last checked.
What is the difference between a soft bounce and a hard bounce?
A soft bounce is temporary, such as a full inbox or a busy server, and the address may still work. A hard bounce is permanent, such as an address that does not exist, and should be removed from your list immediately.
How many soft bounces before I remove an address?
Many platforms suppress an address after three to five consecutive soft bounces, though settings vary. If an address keeps failing over several sends, treat it as inactive and look for another way to reach the person.
Do soft bounces hurt sender reputation?
Occasional soft bounces do little harm. Many at once can signal that providers are throttling or blocking you, which is a reputation warning. Persistently mailing addresses that keep failing also looks like poor list hygiene.
