TL;DR
A business trip auto-reply is different from a vacation auto-reply — you're still working, just at reduced capacity. The framing matters: 'slower but not silent' rather than 'out of office.' Mention the trip purpose only if it's already public (you're at a customer's office, speaking at a conference, attending a trade show). Skip destination details for security and confidentiality. International trips should mention the timezone shift so senders calibrate expectations.
Set up a business trip auto-reply when you'll be traveling for work for 2+ days with reduced email availability. For short trips with normal availability, no auto-reply needed. For trips longer than a week or with very limited connectivity, consider the conference or vacation auto-reply templates instead.
Scenario 1
Subject
Traveling — slower replies through [return date]
Body
Hi, Thanks for your email. I'm traveling for work through [return date] and will be slower than usual to respond — typically replying once a day rather than throughout the day. For anything urgent, please contact [colleague] at [email]. Otherwise, I'll get to your message between meetings or in the evening. Thanks, [Your name]
Scenario 2
Subject
On-site with a customer — limited email through [return date]
Body
Hi, Thanks for reaching out. I'm working on-site with a customer through [return date] with very limited email access. For genuinely urgent matters, please contact [colleague] at [email]. For non-urgent items, I'll respond when I'm back at my desk. Best, [Your name]
Scenario 3
Subject
Traveling internationally — replies on [destination timezone] hours
Body
Hi, Thanks for your message. I'm traveling internationally through [return date] and will be working on [destination timezone] hours — so replies may arrive at unusual times for [home timezone] senders. If your matter is urgent and time-sensitive in [home timezone], please contact [colleague] at [email]. Otherwise, I'll respond as I can. Best, [Your name]
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Only if your responsiveness will be materially different from normal. If you're going to a customer office and replying within 2-3 hours instead of within minutes, that's worth flagging. If you're just on a flight for 6 hours, probably not — your normal cadence already includes time away from email.
Only if it's already publicly known. 'On-site at AcmeCo this week' tells external senders something AcmeCo may not have wanted broadcast. 'At INBOUND 2026' is fine because the conference attendance is public. When in doubt, generic.
State the timezone you'll be working in. 'I'm on Tokyo hours this week (UTC+9), 14 hours ahead of EST' helps US senders predict when they'll hear back. It also discourages 'I emailed you 30 minutes ago, why haven't you replied?' messages from people who didn't think about your travel.
Set up an out-of-office (auto-reply) email when you'll be away from work for a full day or longer — vacations, parental leave, business trips, extended PTO, or personal leave. Most email clients let you schedule the start and end dates.
Use a conference auto-reply when you'll be at a multi-day industry event with reduced email access. Set it to start the morning the conference begins and end the morning after you return. For trade shows where you're working a booth, include the booth number — it converts inbound emails into in-person meetings.
Use a vacation auto-reply when you'll be away from work for two or more days on personal time off — not on business travel, not on extended leave. For trips longer than 10 days or leave for a specific reason (parental, medical, sabbatical), use the more specific templates linked below.