diff --git a/probes/imap/imap_roundtrip_probe.go b/probes/imap/imap_roundtrip_probe.go
index 85ee38e6a50a67c2364e97c2b1bfbe58a8377b09..e1805b6116b675622fcf174667a0746e133ec237 100644
--- a/probes/imap/imap_roundtrip_probe.go
+++ b/probes/imap/imap_roundtrip_probe.go
@@ -20,7 +20,7 @@ import (
 	"git.autistici.org/ai3/tools/service-prober/protocol/ssl"
 )
 
-var defaultCheckInterval = 5 * time.Second
+var defaultCheckInterval = 10 * time.Second
 
 type imapRoundtripProbeSpec struct {
 	DNSMap      map[string]string `json:"dns_map"`